[Jweb] Tomcat 解决编码, 乱码问题

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Know其他： tomcat 解决乱码问题
b.jsp 源码
<%@ page contentType="text/html;charset=GBK"%> 
<%request.setCharacterEncoding("GBK");%> 

<%=request.getParameter("user") %>
<%String s = "哈哈哈";%>
<%=s%>

具体核心：见 csdn, robby_chan 本博。

a1.html

<form action=b.jsp method=get ><input name=user value=我们><input type=submit value=get></form><form action=b.jsp method=post ><input name=user value=他们><input type=submit value=post></form><a href="/my/charset//b.jsp?user=你们">this is a link</a>

TestB.java 张志宇带你详细讲解编码，乱码问题。

public class TestB {    static String zhongwen = "中文";    static byte[] bytes = null;    public static void main(String[] args) throws Exception {        // GBK        // main1();        // utf-8        // main2();        // GBK-->utf-8-->GBK        // main3();        // GBK-->iso8859-1-->utf-8-->iso8859-1-->GBK        main4();    }    // GBK    public static void main1() throws Exception {        bytes = zhongwen.getBytes("GBK");        for (int i = 0; i < bytes.length; i++) {            System.out.println(Integer.toHexString(bytes[i]));        }        System.out.println(new String(bytes, "GBK"));    }    // utf-8    public static void main2() throws Exception {        bytes = zhongwen.getBytes("utf-8");        for (int i = 0; i < bytes.length; i++) {            System.out.println(Integer.toHexString(bytes[i]));        }        System.out.println(new String(bytes, "utf-8"));    }    // GBK-->utf-8-->GBK    public static void main3() throws Exception {        bytes = zhongwen.getBytes("GBK");        System.out.println("--------GBK----------");        for (int i = 0; i < bytes.length; i++) {            System.out.println(Integer.toHexString(bytes[i]));        }        bytes = zhongwen.getBytes("utf-8");        byte[] bytes_copy = bytes;        System.out.println("-------utf-8--------");        for (int i = 0; i < bytes.length; i++) {            System.out.println(Integer.toHexString(bytes[i]));        }        // 错误的组装方法        System.out.println("-------error GBK--------");        zhongwen = new String(bytes, "GBK");        System.out.println(zhongwen);        bytes = zhongwen.getBytes("GBK");        for (int i = 0; i < bytes.length; i++) {            System.out.println(Integer.toHexString(bytes[i]));        }        // 正确的组装方法        System.out.println("-------GBK--------");        System.out.println(new String(bytes_copy, "utf-8"));    }    // GBK-->iso8859-1-->utf-8-->iso8859-1-->GBK    public static void main4() throws Exception {        // 最开始是GBK        bytes = zhongwen.getBytes("GBK");        System.out.println("--------GBK----------");        for (int i = 0; i < bytes.length; i++) {            System.out.println(Integer.toHexString(bytes[i]));        }        // 被组装成了iso8859-1,new出的字符串对象有问题,但是字节内容没变        System.out.println("-------iso8859-1--------");        zhongwen = new String(zhongwen.getBytes("GBK"), "iso8859-1");        System.out.println(zhongwen);        bytes = zhongwen.getBytes("iso8859-1");        for (int i = 0; i < bytes.length; i++) {            System.out.println(Integer.toHexString(bytes[i]));        }        // 转换成utf-8在网络上传输,一个byte转换为两个字节,所以一共8个字节        bytes = zhongwen.getBytes("utf-8");        System.out.println("-------utf-8--------");        for (int i = 0; i < bytes.length; i++) {            System.out.println(Integer.toHexString(bytes[i]));        }        // server端接收到utf-8,首先组装成iso8859-1,new出的字符串对象有问题,显示4个问号        System.out.println("-------server--iso8859-1------");        zhongwen = new String(bytes, "utf-8");        System.out.println(zhongwen);        bytes = zhongwen.getBytes("iso8859-1");        for (int i = 0; i < bytes.length; i++) {            System.out.println(Integer.toHexString(bytes[i]));        }        // 以iso8859-1得到字节,并组装成GBK        System.out.println("-------GBK--------");        System.out.println(new String(bytes, "GBK"));    }    public static void ____________________main() throws Exception {        System.out.println(System.getProperty("file.encoding"));        System.out.println(System.getProperty("user.language"));        System.out.println(System.getProperty("user.region"));    }}

SayHelloBean.html

<html><head><title>数据输入</title><meta http-equiv="Content-Type" content="text/html; charset=gb2312"></head><body bgcolor="#FFFFFF"><div align="center">  <p>请输入数据</p>  <form method="post" action="SayHelloBean.jsp" >    <p>姓名      <input type="text" name="name">         性别      <select name="sex">        <option value="先生">先生</option>        <option value="女士">女士</option>      </select>    </p>    <p>      <input type="submit" name="Submit" value="提交">    </p>  </form>  <p> </p>  <p> </p></div></body></html>

SayHelloBean.jsp

<%@ page language="java" import="bean.HelloBean;" %><%@ page contentType="text/html;charset=gb2312" %><%//request.getParameter("name");//request.setCharacterEncoding("gb2312");%><jsp:useBean id="hello" class="bean.HelloBean" scope="request" >    <jsp:setProperty name="hello" property="*" /></jsp:useBean><html><head><title>HelloBean</title><meta http-equiv="Content-Type" content="text/html; charset=gb2312"></head><body bgcolor="#FFFFFF"><p> </p><p align="center"><font size="4">欢迎<font color="#0000FF"><b>    <%--    <%=new String(hello.getName().getBytes("ISO8859_1"),"GBK")%>--%></b></font><%--<%=new String(hello.getSex().getBytes("ISO8859_1"),"GBK")%>--%></font></p><jsp:getProperty name="hello" property="name"/><jsp:getProperty name="hello" property="sex"/></body></html>

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