8.SpringMVC乱码问题

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1.Servlet的解决办法

1.请求乱码

(1) httpServletRequest.setCharacterEncoding()

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try {
    httpServletRequest.setCharacterEncoding("UTF-8");
    String name = httpServletRequest.getParameter("name");
} catch (UnsupportedEncodingException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

(2)配置Tomcat

conf/server.xml添加URIEncoding="UTF-8"

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<Connector connectionTimeout="20000" port="8080" protocol="HTTP/1.1" redirectPort="8443" URIEncoding="UTF-8" />

(3)String(byte[] bytes, String charsetName)

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String name = httpServletRequest.getParameter("name");
try {
    String nameParam = new String(name.getBytes(), "UTF-8");
} catch (UnsupportedEncodingException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

2.响应乱码

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try {
    // 解决PrintWriter.write(String s)字符串的乱码
    httpServletResponse.setCharacterEncoding("UTF-8");
    PrintWriter printWriter = httpServletResponse.getWriter();
    printWriter.write("hello world");
} catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

// 解决浏览器解析html页面的乱码
httpServletResponse.setContentType("text/html;charset=UTF-8");

3.过滤器

2.SpringMVC的解决方法(过滤器)

web.xml配置文件中添加配置，配置SpringMVC编码过滤器

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<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>01_springmvc_hello</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  
  <!-- 配置SpringMVC编码过滤器 -->
  <filter>
  	<filter-name>encodingFilter</filter-name>
  	<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
  	<!-- 配置编码的值 -->
  	<init-param>
  		<param-name>encoding</param-name>
  		<param-value>UTF-8</param-value>
  	</init-param>
  </filter>
  <filter-mapping>
  	<filter-name>encodingFilter</filter-name>
  	<!-- 
  		方法1: 
        <url-pattern>*.do</url-pattern>
  		<url-pattern>/*</url-pattern>
  	 -->
  	<!-- 
        方法2: 
        指定某个servlet去过滤
     -->
  	<servlet-name>springmvc</servlet-name>
  </filter-mapping>
  
  <!-- 配置前端控制器 -->
  <servlet>
  	<servlet-name>springmvc</servlet-name>
  	<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  	
  	<!-- 加载springmvc.xml -->
  	<init-param>
  		<param-name>contextConfigLocation</param-name>
  		<param-value>classpath:springmvc.xml</param-value>
  	</init-param>
  	
  	<!-- 启动加载 -->
  	<load-on-startup>1</load-on-startup>
  	
  </servlet>
  
  <servlet-mapping>
  	<servlet-name>springmvc</servlet-name>
  	<url-pattern>*.do</url-pattern>
  </servlet-mapping>
  
</web-app>

3.数据库乱码

(1)创建数据库时指定编码

(2)修改jdbc连接url

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jdbc:mysql://127.0.0.1:3306/demo?useUnicode=true&characterEncoding=utf-8

(3)修改mysql数据库的默认编码

mysql安装目录的my.ini配置文件

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# default-character-set=utf8

# character-set-server=utf8

注: utf8不加-