Update EncodingFilter.java

ticketing-master/src/com/cn/filter/EncodingFilter.java

@@ -1,64 +1,70 @@
-package com.cn.filter;
+package com.cn.filter; // 定义过滤器包名
 
-import java.io.IOException;
-
-import javax.servlet.Filter;
-import javax.servlet.FilterChain;
-import javax.servlet.FilterConfig;
-import javax.servlet.ServletException;
-import javax.servlet.ServletRequest;
-import javax.servlet.ServletResponse;
-import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
+import java.io.IOException; // 导入IOException类，用于处理IO异常
+import javax.servlet.Filter; // 导入Filter接口，用于创建过滤器
+import javax.servlet.FilterChain; // 导入FilterChain类，用于过滤器链
+import javax.servlet.FilterConfig; // 导入FilterConfig类，用于过滤器配置
+import javax.servlet.ServletException; // 导入Servlet异常类
+import javax.servlet.ServletRequest; // 导入ServletRequest接口
+import javax.servlet.ServletResponse; // 导入ServletResponse接口
+import javax.servlet.http.HttpServletRequest; // 导入HttpServletRequest类
+import javax.servlet.http.HttpServletResponse; // 导入HttpServletResponse类
 
 /**
  * Servlet Filter implementation class EncodingFilter
+ * <p>该过滤器用于设置请求和响应的编码，确保字符编码的正确性。</p>
  */
 public class EncodingFilter implements Filter {
 
     /**
-     * Default constructor. 
+     * Default constructor.
+     * <p>EncodingFilter的默认构造函数。</p>
      */
     public EncodingFilter() {
         // TODO Auto-generated constructor stub
     }
 
-	/**
-	 * @see Filter#destroy()
-	 */
-	public void destroy() {
-		// TODO Auto-generated method stub
-	}
+    /**
+     * Destroy method.
+     * <p>销毁过滤器时调用的方法，可以在此释放资源。</p>
+     */
+    public void destroy() {
+        // TODO Auto-generated method stub
+    }
 
-	/**
-	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
-	 */
-	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
-		
-		//转换类型
-		HttpServletRequest req=(HttpServletRequest) request; 
-		HttpServletResponse res=(HttpServletResponse) response;  
-		
-		String uri = req.getRequestURI();
-		
-		if(uri.contains(".css") || uri.contains(".js") || uri.contains(".png")|| uri.contains(".jpg")){
-			//如果发现是css或者js文件，直接放行
-			chain.doFilter(request, response);
-		} else {
-			request.setCharacterEncoding("utf-8");
-			response.setCharacterEncoding("utf-8");
-			response.setContentType("text/html;charset=utf-8"); 
-			chain.doFilter(request, response);
-		}
-		
-		
-	}
+    /**
+     * Do filter method.
+     * <p>过滤器的核心方法，用于在请求处理链中执行过滤任务。</p>
+     * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
+     */
+    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
+        // 转换类型
+        HttpServletRequest req = (HttpServletRequest) request; 
+        HttpServletResponse res = (HttpServletResponse) response;  
+        
+        // 获取请求URI
+        String uri = req.getRequestURI();
+        
+        // 如果请求是静态资源（如CSS、JS、图片），则直接放行
+        if (uri.contains(".css") || uri.contains(".js") || uri.contains(".png") || uri.contains(".jpg")) {
+            chain.doFilter(request, response);
+        } else {
+            // 设置请求和响应的编码为UTF-8
+            request.setCharacterEncoding("utf-8");
+            response.setCharacterEncoding("utf-8");
+            response.setContentType("text/html;charset=utf-8"); 
+            // 继续过滤器链
+            chain.doFilter(request, response);
+        }
+    }
 
-	/**
-	 * @see Filter#init(FilterConfig)
-	 */
-	public void init(FilterConfig fConfig) throws ServletException {
-		// TODO Auto-generated method stub
-	}
+    /**
+     * Init method.
+     * <p>初始化过滤器时调用的方法，可以在此进行初始化设置。</p>
+     * @see Filter#init(FilterConfig)
+     */
+    public void init(FilterConfig fConfig) throws ServletException {
+        // TODO Auto-generated method stub
+    }
 
 }