SpringMVC 中文乱码的解决方案
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2022-06-15 17:28:26
背景举个例子，出现中文乱码的例子：提交表单的时候。表单<%@ page contenttype="text/html;charset=utf-8" language="java" %>&l...
背景
举个例子，出现中文乱码的例子：提交表单的时候。
表单
<%@ page contenttype="text/html;charset=utf-8" language="java" %>
<html>
<head>
<title>title</title>
</head>
<body>
<form action="/c02/t1" method="post">
<input type="text" name="name">
<input type="submit">
</form>
</body>
</html>
业务控制类
package controller;
import org.springframework.stereotype.controller;
import org.springframework.ui.model;
import org.springframework.web.bind.annotation.requestmapping;
@controller
public class controllerdemo02 {
@requestmapping("/c02/t1")
public string test1(string name, model model){
system.out.println(name);
model.addattribute("message",name);
return "test";
}
}
结果：出现乱码
解决方案
使用自己写的过滤器
自定义一个filter过滤器，去过滤乱码
package filter;
import javax.servlet.*;
import java.io.ioexception;
public class encodingfilter implements filter {
public void init(filterconfig filterconfig) throws servletexception {
}
public void dofilter(servletrequest servletrequest, servletresponse servletresponse, filterchain filterchain) throws ioexception, servletexception {
servletrequest.setcharacterencoding("utf-8");
servletresponse.setcharacterencoding("utf-8");
filterchain.dofilter(servletrequest,servletresponse);
}
public void destroy() {
}
}
在web.xml中配置这个过滤器
<filter>
<filter-name>encodingfilter</filter-name>
<filter-class>filter.encodingfilter</filter-class>
</filter>
<filter-mapping>
<filter-name>encodingfilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
使用springmvc提供的过滤器
直接在web.xml中配置（固定的）
<filter>
<filter-name>encoding</filter-name>
<filter-class>org.springframework.web.filter.characterencodingfilter</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>
如果上面两种方法还实现不了，在试试以下这个方法，大神编写的
package filter;
import javax.servlet.*;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletrequestwrapper;
import javax.servlet.http.httpservletresponse;
import java.io.ioexception;
import java.io.unsupportedencodingexception;
import java.util.map;
public class genericencodingfilter implements filter {
public void destroy() {
}
public void dofilter(servletrequest request, servletresponse response, filterchain chain) throws ioexception, servletexception {
//处理response的字符编码
httpservletresponse myresponse=(httpservletresponse) response;
myresponse.setcontenttype("text/html;charset=utf-8");
// 转型为与协议相关对象
httpservletrequest httpservletrequest = (httpservletrequest) request;
// 对request包装增强
httpservletrequest myrequest = new myrequest(httpservletrequest);
chain.dofilter(myrequest, response);
}
public void init(filterconfig filterconfig) throws servletexception {
}
}
//自定义request对象，httpservletrequest的包装类
class myrequest extends httpservletrequestwrapper {
private httpservletrequest request;
//是否编码的标记
private boolean hasencode;
//定义一个可以传入httpservletrequest对象的构造函数，以便对其进行装饰
public myrequest(httpservletrequest request) {
super(request);// super必须写
this.request = request;
}
// 对需要增强方法 进行覆盖
public map getparametermap() {
// 先获得请求方式
string method = request.getmethod();
if (method.equalsignorecase("post")) {
// post请求
try {
// 处理post乱码
request.setcharacterencoding("utf-8");
return request.getparametermap();
} catch (unsupportedencodingexception e) {
e.printstacktrace();
}
} else if (method.equalsignorecase("get")) {
// get请求
map<string, string[]> parametermap = request.getparametermap();
if (!hasencode) { // 确保get手动编码逻辑只运行一次
for (string parametername : parametermap.keyset()) {
string[] values = parametermap.get(parametername);
if (values != null) {
for (int i = 0; i < values.length; i++) {
try {
// 处理get乱码
values[i] = new string(values[i]
.getbytes("iso-8859-1"), "utf-8");
} catch (unsupportedencodingexception e) {
e.printstacktrace();
}
}
}
}
hasencode = true;
}
return parametermap;
}
return super.getparametermap();
}
//取一个值
public string getparameter(string name) {
map<string, string[]> parametermap = getparametermap();
string[] values = parametermap.get(name);
if (values == null) {
return null;
}
return values[0]; // 取回参数的第一个值
}
//取所有值
public string[] getparametervalues(string name) {
map<string, string[]> parametermap = getparametermap();
string[] values = parametermap.get(name);
return values;
}
}
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