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chenhaoxiangchenhaoxiang
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全站压缩
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‎myGzipWeb/.classpath

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<?xml version="1.0" encoding="UTF-8"?>
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<classpath>
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<classpathentry kind="src" path="src"/>
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<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
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<classpathentry kind="con" path="melibrary.com.genuitec.eclipse.j2eedt.core.MYECLIPSE_JAVAEE_6_CONTAINER"/>
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<classpathentry kind="con" path="org.eclipse.jst.j2ee.internal.web.container"/>
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<classpathentry kind="con" path="org.eclipse.jst.j2ee.internal.module.container"/>
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<classpathentry kind="output" path="WebRoot/WEB-INF/classes"/>
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</classpath>

‎myGzipWeb/.mymetadata

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<?xml version="1.0" encoding="UTF-8"?>
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<project-module
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type="WEB"
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name="myGzipWeb"
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id="myeclipse.1471575965748"
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context-root="/myGzipWeb"
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j2ee-spec="6.0"
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archive="myGzipWeb.war">
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<attributes>
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<attribute name="webrootdir" value="WebRoot" />
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</attributes>
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</project-module>
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‎myGzipWeb/.project

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<?xml version="1.0" encoding="UTF-8"?>
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<projectDescription>
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<name>myGzipWeb</name>
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<comment></comment>
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<projects>
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</projects>
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<buildSpec>
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<buildCommand>
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<name>org.eclipse.wst.common.project.facet.core.builder</name>
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<arguments>
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</arguments>
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</buildCommand>
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<buildCommand>
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<name>org.eclipse.wst.jsdt.core.javascriptValidator</name>
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<arguments>
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</arguments>
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</buildCommand>
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<buildCommand>
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<name>com.genuitec.eclipse.j2eedt.core.WebClasspathBuilder</name>
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<arguments>
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</arguments>
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</buildCommand>
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<buildCommand>
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<name>org.eclipse.jdt.core.javabuilder</name>
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<arguments>
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</arguments>
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</buildCommand>
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<buildCommand>
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<name>com.genuitec.eclipse.j2eedt.core.J2EEProjectValidator</name>
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<arguments>
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</arguments>
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</buildCommand>
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<buildCommand>
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<name>com.genuitec.eclipse.j2eedt.core.DeploymentDescriptorValidator</name>
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<arguments>
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</arguments>
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</buildCommand>
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<buildCommand>
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<name>org.eclipse.wst.validation.validationbuilder</name>
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<arguments>
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</arguments>
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</buildCommand>
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<buildCommand>
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<name>com.genuitec.eclipse.ast.deploy.core.DeploymentBuilder</name>
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<arguments>
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</arguments>
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</buildCommand>
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</buildSpec>
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<natures>
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<nature>com.genuitec.eclipse.ast.deploy.core.deploymentnature</nature>
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<nature>org.eclipse.jem.workbench.JavaEMFNature</nature>
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<nature>com.genuitec.eclipse.j2eedt.core.webnature</nature>
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<nature>org.eclipse.jdt.core.javanature</nature>
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<nature>org.eclipse.wst.jsdt.core.jsNature</nature>
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<nature>org.eclipse.wst.common.project.facet.core.nature</nature>
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<nature>org.eclipse.wst.common.modulecore.ModuleCoreNature</nature>
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</natures>
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</projectDescription>

‎myGzipWeb/.settings/.jsdtscope

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<?xml version="1.0" encoding="UTF-8"?>
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<classpath>
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<classpathentry kind="src" path="WebRoot"/>
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<classpathentry kind="con" path="org.eclipse.wst.jsdt.launching.JRE_CONTAINER"/>
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<classpathentry kind="con" path="org.eclipse.wst.jsdt.launching.WebProject">
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<attributes>
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<attribute name="hide" value="true"/>
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</attributes>
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</classpathentry>
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<classpathentry kind="con" path="org.eclipse.wst.jsdt.launching.baseBrowserLibrary"/>
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<classpathentry kind="output" path=""/>
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</classpath>

‎myGzipWeb/.settings/org.eclipse.jdt.core.prefs

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#Fri Aug 19 11:06:07 CST 2016
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eclipse.preferences.version=1
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org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
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org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.6
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org.eclipse.jdt.core.compiler.compliance=1.6
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org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
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org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
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org.eclipse.jdt.core.compiler.source=1.6

‎myGzipWeb/.settings/org.eclipse.wst.common.component

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<?xml version="1.0" encoding="UTF-8"?>
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<project-modules id="moduleCoreId" project-version="1.5.0">
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<wb-module deploy-name="myGzipWeb">
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<wb-resource deploy-path="/" source-path="/WebRoot"/>
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<wb-resource deploy-path="/WEB-INF/classes" source-path="/src"/>
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<property name="context-root" value="/myGzipWeb"/>
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<property name="java-output-path" value="/myGzipWeb/WebRoot/WEB-INF/classes"/>
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</wb-module>
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</project-modules>

‎myGzipWeb/.settings/org.eclipse.wst.common.project.facet.core.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<faceted-project>
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<fixed facet="wst.jsdt.web"/>
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<installed facet="java" version="1.6"/>
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<installed facet="jst.web" version="3.0"/>
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<installed facet="wst.jsdt.web" version="1.0"/>
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</faceted-project>

‎myGzipWeb/.settings/org.eclipse.wst.jsdt.ui.superType.container

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org.eclipse.wst.jsdt.launching.baseBrowserLibrary

‎myGzipWeb/.settings/org.eclipse.wst.jsdt.ui.superType.name

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Window

‎myGzipWeb/README.md

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全站压缩
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全站压缩，最大的好久就是帮客户端节省流量。
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数据压缩，我们需要用到二个Java类，也就是java.util.zip 中的
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类 GZIPOutputStream
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此类为使用 GZIP 文件格式写入压缩数据实现流过滤器。
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java.io
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类 ByteArrayOutputStream
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此类实现了一个输出流，其中的数据被写入一个 byte 数组。缓冲区会随着数据的不断写入而自动增长。可使用 toByteArray() 和 toString() 获取数据。
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我们利用GZIPOutputStream(OutputStream out) 使用默认缓冲区大小创建新的输出流。
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再用write(byte[] b)将 b.length 个字节写入此输出流。
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也就是把数据压缩后写入ByteArrayOutputStream。

‎myGzipWeb/WebRoot/META-INF/MANIFEST.MF

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Manifest-Version: 1.0
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Class-Path:
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‎myGzipWeb/WebRoot/WEB-INF/classes/cn/hncu/filter/GzipFilter.class

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‎myGzipWeb/WebRoot/WEB-INF/classes/cn/hncu/filter/MyOutputStream.class

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‎myGzipWeb/WebRoot/WEB-INF/classes/cn/hncu/filter/MyResponse.class

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‎myGzipWeb/WebRoot/WEB-INF/classes/cn/hncu/servlets/FirstGzipServlet.class

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‎myGzipWeb/WebRoot/WEB-INF/classes/cn/hncu/servlets/SecondServlet.class

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‎myGzipWeb/WebRoot/WEB-INF/classes/cn/hncu/servlets/ThirdServlet.class

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‎myGzipWeb/WebRoot/WEB-INF/web.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<web-app version="3.0"
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xmlns="http://java.sun.com/xml/ns/javaee"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
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http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
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<display-name></display-name>
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<filter>
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<filter-name>gzip</filter-name>
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<filter-class>cn.hncu.filter.GzipFilter</filter-class>
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</filter>
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<filter-mapping>
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<filter-name>gzip</filter-name>
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<url-pattern>/*</url-pattern>
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</filter-mapping>
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<servlet>
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<servlet-name>FirstGzipServlet</servlet-name>
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<servlet-class>cn.hncu.servlets.FirstGzipServlet</servlet-class>
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</servlet>
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<servlet>
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<servlet-name>SecondServlet</servlet-name>
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<servlet-class>cn.hncu.servlets.SecondServlet</servlet-class>
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</servlet>
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<servlet>
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<servlet-name>ThirdServlet</servlet-name>
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<servlet-class>cn.hncu.servlets.ThirdServlet</servlet-class>
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</servlet>
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<servlet-mapping>
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<servlet-name>FirstGzipServlet</servlet-name>
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<url-pattern>/FirstGzipServlet</url-pattern>
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</servlet-mapping>
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<servlet-mapping>
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<servlet-name>SecondServlet</servlet-name>
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<url-pattern>/servlet/SecondServlet</url-pattern>
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</servlet-mapping>
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<servlet-mapping>
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<servlet-name>ThirdServlet</servlet-name>
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<url-pattern>/servlet/ThirdServlet</url-pattern>
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</servlet-mapping>
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<welcome-file-list>
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<welcome-file>index.jsp</welcome-file>
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</welcome-file-list>
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</web-app>

‎myGzipWeb/WebRoot/index.jsp

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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
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<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<title>过滤器应用示例---全站压缩</title>
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</head>
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<body>
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<h2>过滤器应用示例---全站压缩</h2>
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<a href="<c:url value='/FirstGzipServlet'/>">请求第一个servlet--网页压缩输出的基本原理</a> <br/><br/>
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<a href="<c:url value='/servlet/SecondServlet'/>">请求第二个servlet--用过滤器压缩输出字节流数据</a><br/><br/>
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<a href="<c:url value='/servlet/ThirdServlet'/>">请求第三个servlet--用过滤器压缩输出字符流数据</a><br/><br/>
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</body>
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</html>

‎myGzipWeb/src/cn/hncu/filter/GzipFilter.java

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package cn.hncu.filter;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.io.OutputStreamWriter;
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import java.io.PrintWriter;
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import java.util.zip.GZIPOutputStream;
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import javax.servlet.Filter;
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import javax.servlet.FilterChain;
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import javax.servlet.FilterConfig;
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import javax.servlet.ServletException;
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import javax.servlet.ServletOutputStream;
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import javax.servlet.ServletRequest;
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import javax.servlet.ServletResponse;
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import javax.servlet.http.HttpServletResponse;
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import javax.servlet.http.HttpServletResponseWrapper;
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public class GzipFilter implements Filter {
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@Override
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public void init(FilterConfig filterConfig) throws ServletException {
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}
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@Override
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public void doFilter(ServletRequest request, ServletResponse response,
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FilterChain chain) throws IOException, ServletException {
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MyResponse resp = new MyResponse((HttpServletResponse) response);
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// 用增强版的resp放行到servlet中去用(让后台把数据 写到 baout中 )
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chain.doFilter(request, resp);// 放行--让后台去写
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// 从增强版的resp的baout中(存放的是源字节数据)，把数据取出来进行压缩，
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// 然后再压缩后的数据用原生的response输出到客户端
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ByteArrayOutputStream baout = resp.getBaout();
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byte bs[] = baout.toByteArray();// 源字节数据
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System.out.println("压缩前大小:" + bs.length);
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ByteArrayOutputStream baout2 = new ByteArrayOutputStream();
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GZIPOutputStream gout = new GZIPOutputStream(baout2);
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gout.write(bs);// 把数据压缩到baout中
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gout.close();
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bs = baout2.toByteArray();
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System.out.println("压缩后大小:" + bs.length);
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// 输出之前告诉客户端:我们的数据是gzip格式，然后输出
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HttpServletResponse httpResp = (HttpServletResponse) response;
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httpResp.setHeader("Content-Encoding", "gzip");
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httpResp.setContentLength(bs.length);
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OutputStream out = httpResp.getOutputStream();
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out.write(bs);
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}
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@Override
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public void destroy() {
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}
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}
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class MyResponse extends HttpServletResponseWrapper {
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private ByteArrayOutputStream baout = new ByteArrayOutputStream();
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public MyResponse(HttpServletResponse response) {
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super(response);
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}
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@Override
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public ServletOutputStream getOutputStream() throws IOException {
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return new MyOutputStream(baout);
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}
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public ByteArrayOutputStream getBaout() {
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if(pw!=null){
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pw.flush();
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//这里很重要，如果不flush或close，不把字符流刷出去，baout中是不会有数据的.
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}
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return baout;
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}
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private PrintWriter pw;
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@Override
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public PrintWriter getWriter() throws IOException {
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pw = new PrintWriter(new OutputStreamWriter(baout, "utf-8"),true);
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return pw;
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}
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}
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class MyOutputStream extends ServletOutputStream {
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private ByteArrayOutputStream baout = null;
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public MyOutputStream(ByteArrayOutputStream baout) {
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this.baout = baout;
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}
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@Override
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public void write(int b) throws IOException {
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baout.write(b);
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}
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}

‎myGzipWeb/src/cn/hncu/servlets/FirstGzipServlet.java

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package cn.hncu.servlets;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.io.PrintWriter;
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import java.util.zip.GZIPOutputStream;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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public class FirstGzipServlet extends HttpServlet {
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public void doGet(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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doPost(request, response);
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}
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public void doPost(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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response.setContentType("text/html;charset=utf-8");
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String str = "网页压缩数据hncuhdncu网页压缩数据hncuh数据hncuhdncu网页压缩数据hncuh数据hncuhdncu网页压缩数据hncuhdncu网页压缩数据hncuhdncu";
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System.out.println("原大小:" + str.getBytes("utf-8").length);
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// 压缩输出--把源数据压缩输出到baout内存流中
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ByteArrayOutputStream baout = new ByteArrayOutputStream();
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GZIPOutputStream gout = new GZIPOutputStream(baout);
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gout.write(str.getBytes("utf-8"));
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gout.close();
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// 从baout内存流中把压缩后的数据取出来，输出到客户端
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byte dest[] = baout.toByteArray();
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System.out.println("压缩后的大小:" + dest.length);
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//输出之前告诉客户端:我们的数据是gzip格式，然后输出
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response.setHeader("Content-Encoding", "gzip");
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response.setContentLength(dest.length);
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OutputStream out = response.getOutputStream();
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out.write(dest);
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out.close();
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}
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}

‎myGzipWeb/src/cn/hncu/servlets/SecondServlet.java

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package cn.hncu.servlets;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.io.PrintWriter;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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public class SecondServlet extends HttpServlet {
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public void doGet(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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doPost(request, response);
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}
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public void doPost(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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response.setContentType("text/html;charset=utf-8");
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String str = "网页压缩数据hncuhdncu网页压缩数据hncuh数据hncuhdncu网页压缩数据hncuh数据hncuhdncu网页压缩数据hncuhdncu网页压缩数据hncuhdncu";
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System.out.println("原大小:" + str.getBytes("utf-8").length);
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OutputStream out = response.getOutputStream();
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out.write(str.getBytes("utf-8"));
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//注意，虽然MyEclipse环境设置的是utf-8编码，但本句“str.getBytes()”却是以gbk方式编码---应该是Tomcat中的JVM采用的方式
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}
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}

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