Java Web中数据从前端输入到插入数据库,哪些地方需要考虑字符编码?

1、JSP页面:
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

2、JDBC获取连接时:


<span style="font-size:14px;">DriverManager.getConnection("jdbc:mysql://localhost:3306/developerdb?useUnicode=true&characterEncoding=utf8", "developer", "developer");</span>

3、Tomcat

浏览器请求传到Tomcat容器的时候还会经历一次编码转换,而Tomcat7.0对请求的默认编码字符集是ISO8859-1(还没找到Tomcat的官方文档来支持这一观点),所以解决方法就是在java代码里对请求再次进行编码转换。其中有两种处理方式:

(1)对参数值的字符串进行编码转换。

new String(request.getParameter("name").getByte("ISO-8859-1"),"UTF-8");

(2)对进入容器的所有请求进行编码转换。这个方式需要配置一个过滤器,然后在web.xml中调用

<span style="font-size:14px;">public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {
    request.setCharacterEncoding("utf-8");
    chain.doFilter(request, response);
}</span>
或在servlet的doPost方法的最开始加上两句

request.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=UTF-8");

(3)如果使用spring,可以直接调用spring的包

<!-- CharacterEncodingFilter provided by SpringFramework -->
<filter>
    <filter-name>characterEncodingFilter</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>
    <init-param>
        <param-name>forceEncoding</param-name>
        <param-value>true</param-value>
    </init-param>
</filter>

<filter-mapping>
    <filter-name>characterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>




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