Java中常遇的中文乱码问题解决方案

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我是靠谱客的博主无情时光，最近开发中收集的这篇文章主要介绍Java中常遇的中文乱码问题解决方案，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

说明：将编码设置为“utf-8”和“gb2312”，均能解决乱码问题，需要注意的是，一定要保证所有的编码一致，这里我采用“utf-8”

1.解决request请求中的中文乱码问题

get请求方式解决方案

String param = request.getParameter("param");
param = new String(param.getBytes("ISO-8859-1"）, "utf-8");

post请求方式解决方案

reqeust.setCharacterEncoding("utf-8")

2.解决response响应中的中文乱码问题

response.setCharacterEncoding("utf-8");

3.解决HTML页面中的中文乱码问题

<META http-equiv=Content-Type content="text/html;charset=utf-8">

4.解决JSP页面中的中文乱码问题

<%@ page contentType="text/html;charset=utf-8" language="Java"%>

5.解决页面数据传输的中文乱码问题


<filter>
<filter-name>encodingFilter</filter-name>
<filter-class> cn.nd.filter.Filter
</filter-class>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

Filter代码：

package cn.nd.filter;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.Map;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;
public class Filter implements javax.servlet.Filter {
public void destroy() {
// TODO Auto-generated method stub
}
public void doFilter(ServletRequest req, ServletResponse res,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest request=(HttpServletRequest) req;
HttpServletResponse response=(HttpServletResponse) res;
HttpServletRequest myrequest=new MyRequest(request);
response.setContentType("text/html;charset=utf-8");
chain.doFilter(myrequest, response);
}
public void init(FilterConfig arg0) throws ServletException {
// TODO Auto-generated method stub
}
}
class MyRequest extends HttpServletRequestWrapper {
private HttpServletRequest request;
public MyRequest(HttpServletRequest request) {
super(request);
this.request = request;
}
// 重写关于获取请求参数的方法.
@Override
public String getParameter(String name) {
Map<String, String[]> map = getParameterMap();
if(name==null){
return null;
}
String[] values=map.get(name);
if(values==null||values.length==0){
return null;
}
return values[0];
}
@Override
public String[] getParameterValues(String name) {
Map<String, String[]> map = getParameterMap();
if(name==null){
return null;
}
String[] values=map.get(name);
return values;
}
private boolean flag = true;
@Override
public Map getParameterMap() {
// 1.得到所有请求参数的Map集合
Map<String, String[]> map = request.getParameterMap();
// 有编码问题.
if(flag){
for(String s:map.keySet()){
String[] values=map.get(s);
for(int i=0;i<values.length;i++){
try {
values[i]=new String(values[i].getBytes("iso8859-1"),"utf-8");
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
flag=false;
}
return map;
}
}