中文乱码原理代码：
String s = "中文";
byte[] bs2 = s.getBytes("utf-8");//将s拆成：utf-8个体，注：utf-8指s原本就是utf-8
String s1 = new String(bs2,"iso-8859-1");//将bs2组装成：iso-8859-1串
String s2 = new String(bs2,"utf-8");//将bs2组装成：utf-8串
String s3 = new String(s1.getBytes("iso-8859-1"),"utf-8");//将s1拆成iso-8859-1串，然后组装成utf-8
System.out.println(s1+"\n"+s2+"\n"+s3);
结果：
??????
中文
中文
实例源码下载：http://download.csdn.net/detail/poiuy1991719/8594485
解决HttpClient中文乱码，项目演示：
1：编写httpClient_001
所需包：
1、1：编写URLUtil类
package com.west.test.httpclient;
public class URLUtil {
public static final String HttpClient_002="http://localhost:8080/httpClient_002/";//访问本地项目2路径
public static final String POST_CONTENT=HttpClient_002+"PostContent";
}1、2：编写Servlet类
package com.west.test.httpclient; import java.io.IOException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.PostMethod;
import javax.servlet.ServletException; public class PostServlet extends HttpServlet {
@Override
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
System.out.println("========httpClient_001 PostServlet start=========");
System.out.println("httpClient_001:doPost方式提交");
HttpClient httpClient = new HttpClient();
PostMethod method = new PostMethod(URLUtil.POST_CONTENT);
// 解决中文乱码(设置："我方"HttpClient提交、解析所用码)
method.getParams().setContentCharset("utf-8"); String charset=method.getParams().getContentCharset();
NameValuePair name = new NameValuePair("name", "张三");
NameValuePair password = new NameValuePair("password",
"password:123321");
method.setRequestBody(new NameValuePair[] { name, password });
String rt = "";
try {
int status = httpClient.executeMethod(method);
if (status == HttpStatus.SC_OK) {
rt = method.getResponseBodyAsString();
System.out.println("httpClient_001得到：" + rt);
codeTest(rt,charset);
}
} catch (Exception e) {
e.printStackTrace();
System.out.println("网络连接失败，请联系管理员！");
}
// 释放HttpClient资源
method.releaseConnection();
outMessage(response, rt); } protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
System.out.println("httpClient_001:doGet方式提交");
doPost(request, response); } public void outMessage(HttpServletResponse response, String message) {
try {
// 解决"界面"中文乱码(设置："我方"提交所用码、"对方"解析所用码)
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
out.print(message);
out.close();
} catch (IOException e) {
e.printStackTrace();
}
} public void codeTest(String rt ,String charset) throws Exception { System.out.println("得到的是："+charset);
byte[] btr=rt.getBytes(charset);
String rt01 = new String(btr, "iso-8859-1");
System.out.println("String(btr,'iso-8859-1')转码01：" + rt01);
String rt02 = new String(btr, "utf-8");
System.out.println("String(btr,'utf-8')转码02：" + rt02);
String rt03 = new String(rt01.getBytes("iso-8859-1"), "utf-8");
System.out.println(rt03); }
}
1.3：配置web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<display-name>test</display-name> <servlet>
<servlet-name>PostServlet</servlet-name>
<servlet-class>com.west.test.httpclient.PostServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>PostServlet</servlet-name>
<url-pattern>/PostServlet</url-pattern>
</servlet-mapping> <session-config>
<session-timeout></session-timeout>
</session-config>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
1、3：编写界面：index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<html>
<head>
<title>test</title>
</head>
<body>
<form action="PostServlet" method="post">
<input type="submit" value="Post提交">
</form>
</body>
</html>
2：编写项目：httpClient_002
2、1：编写Servlet类
package com.test.servlet; import java.io.IOException;
import java.io.PrintWriter; import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; public class PostContent extends HttpServlet {
@Override
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
System.out.println("=========httpClient_002 PostContent start============");
System.out.println("httpClient_002:doPost方式执行");
// 解决中文乱码(设置:"我方"解析所用码)
request.setCharacterEncoding("utf-8"); String name = request.getParameter("name");
String password = request.getParameter("password");
System.out.println("httpClient_002得到:{name：" + name+",password:"+password+"}");
String reStr = "{name=" + name + ",password="
+ password+"}";
outMessage(response, reStr);
} public void outMessage(HttpServletResponse response, Object message) {
try {
// 解决中文乱码(设置："我方"提交所用码，"httpClient_001"解析所用码)
response.setContentType("text/html;charset=utf-8"); PrintWriter out = response.getWriter();
out.print(message);
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
2.2：配置web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<display-name>test002</display-name> <servlet>
<servlet-name>PostContent</servlet-name>
<servlet-class>com.test.servlet.PostContent</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>PostContent</servlet-name>
<url-pattern>/PostContent</url-pattern>
</servlet-mapping> <welcome-file-list>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
</welcome-file-list>
</web-app>
3：总结
1、解决中文乱码(设置："我方"HttpClient提交、解析所用码)
method.getParams().setContentCharset("utf-8"); 2、解决"界面"中文乱码(设置："我方"提交所用码、"对方"解析所用码)
response.setContentType("text/html;charset=utf-8"); 3、解决中文乱码(设置:"我方"解析所用码)
request.setCharacterEncoding("utf-8"); 4、解决中文乱码(设置："我方"提交所用码、"httpClient_001"解析所用码)，同2
response.setContentType("text/html;charset=utf-8");
附加：
请求网页、servlet：
GetMethod getMethod = new GetMethod("http://www.baidu.com");
//（1）、这里可以设置自己想要的编码格式
getMethod.getParams().setContentCharset("utf-8");
//（2）、对于get方法也可以这样设置
getMethod.getParams().setParameter(HttpMethodParams.HTTP_CONTENT_CHARSET,"GB2312");
//（3）、还可以如下这样设置
getMethod.addRequestHeader("Content-Type", "text/html; charset=UTF-8");
//（4）、当然同样可以直接设置 httpClient 对象的编码格式
HttpClient httpClient = new HttpClient();
httpClient.getParams().setContentCharset("utf-8");
//使用流的方式读取也可以如下设置
InputStream in = getMethod.getResponseBodyAsStream();
//这里的编码规则要与上面的相对应
BufferedReader br = new BufferedReader(new InputStreamReader(in,"utf-8"));请求方法、servlet：
PostMethod PostMethod= new PostMethod("http://localhost:8080/ezid-cert-mobile/upload");
//（1）、通常可以如下设置自己想要的编码格式
postMethod.getParams().setParameter(HttpMethodParams.HTTP_CONTENT_CHARSET,"utf-8");
//（2）、也重载PostMethod的getRequestCharSet()方法
public class UTF8PostMethod extends PostMethod{
public UTF8PostMethod(String url){
super(url);
}
@Override
public String getRequestCharSet() {
return "UTF-8";
}
}
//（3）、如果是方法的参数出现乱码问题，那么你可以如下设置参数
Charset utf8Charset = Charset.forName("UTF-8");
multipartContent.addPart("name", new StringBody(Info.getUserEntity().getName(), utf8Charset));
//（4）、如果你用的是Part [] parts={...}传参方式的话可以如下设置
StringPart name=new StringPart("name",certFormEntity.getPersonName(), "UTF-8");