java 出现乱码如何解决
(一)post
[1]通过request.setCharacterEncodeing("UTF-8");
[2]通过String name = new String(request.getParameter("name").getBytes("ios8859-1"),"utf-8")
[3]在web.xml配置一个过滤器filter
[4]如果是spring ,在web.xml配置一个过滤器：org.springframework.web.filter.CharacterEncodingFilter
src 处理输出代码
[1]通过request.setCharacterEncodeing("UTF-8");
[2]通过String name = new String(request.getParameter("name").getBytes("ios8859-1"),"utf-8")
[3]在web.xml配置一个过滤器filter
[4]如果是spring ,在web.xml配置一个过滤器：org.springframework.web.filter.CharacterEncodingFilter
[5Struts2]待看
(二)get
[1]在tomcat中servlet.xml中增加URIEncoding="UTF-8"
[2]用上面的通过String name = new String(request.getParameter("name").getBytes("ios8859-1"),"utf-8")
代码实现（注释部分为实现的）
login.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>测试</title> </head> <body> <form action="login" method="get"> <table align="center"> <tr> <td>用户名： <input type="text" name="username"></input></td> </tr> <tr> <td>密码： <input type="password" name="password"></input> </td> </tr> <tr> <td align="center"><input type="submit" value="登陆"></input></td> </tr> </table> </form> </body> </html>
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app 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">
<servlet>
<servlet-name>Login</servlet-name>
<servlet-class>com.ay.login.LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Login</servlet-name>
<url-pattern>/login</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>login.jsp</welcome-file>
</welcome-file-list>
<!-- <filter>
<filter-name>encoding</filter-name>
<filter-class>com.ay.login.SetCharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>utf-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping> -->
<!-- 使用spring作为过滤器， -->
<!--<filter> -->
<!-- 过滤器使用spring类CharacterEncodingFilter -->
<!-- <filter-name>encodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name> -->
<!-- 过滤器过滤后的编码为utf-8 -->
<!-- <param-value>utf-8</param-value>
</init-param>
</filter>
<filter-mapping> -->
<!-- 过滤所有的路径：/*代表所有的路径 -->
<!--<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping> -->
</web-app>
filter
package com.ay.login;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
public class SetCharacterEncodingFilter implements Filter {
/**
* The default character encoding to set for requests that pass through
* this filter.
*/
protected String encoding = null;
/**
* The filter configuration object we are associated with. If this value
* is null, this filter instance is not currently configured.
*/
protected FilterConfig filterConfig = null;
/**
* Should a character encoding specified by the client be ignored?
*/
protected boolean ignore = true;
public void destroy() {
this.encoding = null;
this.filterConfig = null;
}
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
// Conditionally select and set the character encoding to be used
System.out.println("encoding1->"+encoding);
if (ignore || (request.getCharacterEncoding() == null)) {
String encoding = selectEncoding(request);
if (encoding != null)
request.setCharacterEncoding(encoding);
}
chain.doFilter(request, response);
}
/**
* Place this filter into service.
* @param filterConfig The filter configuration object
*/
public void init(FilterConfig filterConfig) throws ServletException {
System.out.println("encoding2"+encoding);
this.filterConfig = filterConfig;
this.encoding = filterConfig.getInitParameter("encoding");
String value = filterConfig.getInitParameter("ignore");
if (value == null)
this.ignore = true;
else if (value.equalsIgnoreCase("true"))
this.ignore = true;
else if (value.equalsIgnoreCase("yes"))
this.ignore = true;
else
this.ignore = false;
}
protected String selectEncoding(ServletRequest request) {
return (this.encoding);
}
}src 处理输出代码
package com.ay.login;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class LoginServlet extends HttpServlet{
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//一、post
//// //1.设置编码格式
//// request.setCharacterEncoding("UTF-8");
// System.out.println("登陆");
// String name=request.getParameter("username");
// String password=request.getParameter("password");
// //2.通过getBtyes("ios8859-1")转化成“UTF-8”
//// String uname = new String(name.getBytes("iso8859-1"),"UTF-8");
//// System.out.println("uname:"+uname);
// //3.增加一个过滤器Filter(自己写的)
// System.out.println("用户名："+name);
// System.out.println("密码："+password);
// //4.如果用Struts,以后会专门写一下关于Struts2如何解决乱码
// //5.若使用了spring也简单，配置一个spring中提供的拦截器：
//二、get
//1.通过getBtyes("ios8859-1")转化成“UTF-8”
String name=request.getParameter("username");
String password=request.getParameter("password");
// String uname = new String(name.getBytes("iso8859-1"),"UTF-8");
// System.out.println("uname："+uname);
System.out.println("用户名："+name);
System.out.println("密码："+password);
//2.设置tomcat服务器的server.xml这个文件，找到下面的这个段代码，添加上URIEncoding="UTF-8"，在下面这个配置中
//<connector URIEncoding="UTF-8" redirectPort="8443" protocol="HTTP/1.1" port="8080" connectionTimeout
}
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doGet(request, response);
}
}
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