用java中的过滤器写两个filter,一个响应,一个请求,来处理字符乱码问题
时间: 2023-05-17 09:03:19 浏览: 58
好的,我可以回答这个问题。以下是使用Java过滤器处理字符乱码问题的示例代码:
请求过滤器:
```java
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
public class RequestFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
// 初始化方法
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
HttpServletRequest httpRequest = (HttpServletRequest) request;
httpRequest.setCharacterEncoding("UTF-8"); // 设置请求编码为UTF-8
chain.doFilter(request, response);
}
@Override
public void destroy() {
// 销毁方法
}
}
```
响应过滤器:
```java
import javax.servlet.*;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
public class ResponseFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
// 初始化方法
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
HttpServletResponse httpResponse = (HttpServletResponse) response;
httpResponse.setCharacterEncoding("UTF-8"); // 设置响应编码为UTF-8
chain.doFilter(request, response);
}
@Override
public void destroy() {
// 销毁方法
}
}
```
在web.xml中配置过滤器:
```xml
<filter>
<filter-name>RequestFilter</filter-name>
<filter-class>RequestFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>RequestFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter>
<filter-name>ResponseFilter</filter-name>
<filter-class>ResponseFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>ResponseFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
```
这样就可以在Java Web应用中使用过滤器来处理字符乱码问题了。