SpringMVC篇(七)亂碼問題
阿新 • • 發佈:2020-12-14
技術標籤:SpringMVC篇亂碼過濾器springjava
亂碼問題
測試步驟:
1、我們可以在首頁編寫一個提交的表單
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<form action="/e/t1" method="post">
<input type="text" name="name">
<input type="submit">
</form>
</body>
</html>
2、後臺編寫對應的處理類
@Controller
public class Encoding {
@RequestMapping("/e/t")
public String test(Model model,String name){
model.addAttribute ("msg",name); //獲取表單提交的值
return "test"; //跳轉到test頁面顯示輸入的值
}
}
3、輸入中文測試,發現亂碼
亂碼問題通過過濾器解決 , 而SpringMVC給我們提供了一個過濾器 , 可以在web.xml中配置 .
修改了xml檔案需要重啟伺服器!
配置Springmvc的亂碼過濾器
<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>
但是我們發現 , 有些極端情況下.這個過濾器對get的支援不好 .
處理方法 :
1、修改tomcat配置檔案 :設定編碼!
<Connector URIEncoding="utf-8" port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" />
2、自定義過濾器
package com.ni.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;
/**
* 解決get和post請求 全部亂碼的過濾器
*/
public class GenericEncodingFilter implements Filter {
@Override
public void destroy() {
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
//處理response的字元編碼
HttpServletResponse myResponse=(HttpServletResponse) response;
myResponse.setContentType("text/html;charset=UTF-8");
// 轉型為與協議相關物件
HttpServletRequest httpServletRequest = (HttpServletRequest) request;
// 對request包裝增強
HttpServletRequest myrequest = new MyRequest(httpServletRequest);
chain.doFilter(myrequest, response);
}
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
}
//自定義request物件,HttpServletRequest的包裝類
class MyRequest extends HttpServletRequestWrapper {
private HttpServletRequest request;
//是否編碼的標記
private boolean hasEncode;
//定義一個可以傳入HttpServletRequest物件的建構函式,以便對其進行裝飾
public MyRequest(HttpServletRequest request) {
super(request);// super必須寫
this.request = request;
}
// 對需要增強方法 進行覆蓋
@Override
public Map getParameterMap() {
// 先獲得請求方式
String method = request.getMethod();
if (method.equalsIgnoreCase("post")) {
// post請求
try {
// 處理post亂碼
request.setCharacterEncoding("utf-8");
return request.getParameterMap();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
} else if (method.equalsIgnoreCase("get")) {
// get請求
Map<String, String[]> parameterMap = request.getParameterMap();
if (!hasEncode) { // 確保get手動編碼邏輯只執行一次
for (String parameterName : parameterMap.keySet()) {
String[] values = parameterMap.get(parameterName);
if (values != null) {
for (int i = 0; i < values.length; i++) {
try {
// 處理get亂碼
values[i] = new String(values[i]
.getBytes("ISO-8859-1"), "utf-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
}
}
hasEncode = true;
}
return parameterMap;
}
return super.getParameterMap();
}
//取一個值
@Override
public String getParameter(String name) {
Map<String, String[]> parameterMap = getParameterMap();
String[] values = parameterMap.get(name);
if (values == null) {
return null;
}
return values[0]; // 取回引數的第一個值
}
//取所有值
@Override
public String[] getParameterValues(String name) {
Map<String, String[]> parameterMap = getParameterMap();
String[] values = parameterMap.get(name);
return values;
}
}