以下是一个简单的JSP Filter示例，该示例演示了如何在Filter中设置返回值。

```java

jsp filter return实例，jspfilterreturn实例 第1张

import javax.servlet.*;

import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

public class MyFilter implements Filter {

@Override

public void init(FilterConfig filterConfig) throws ServletException {

// Filter初始化时调用

}

@Override

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {

// 获取HttpServletResponse对象

HttpServletResponse httpResponse = (HttpServletResponse) response;

// 设置返回值

httpResponse.setStatus(HttpServletResponse.SC_MOVED_PERMANENTLY);

httpResponse.setHeader("