Eclipse中使用自定义模板来弥补Myeclipse没有新建Filter的功能

Myeclipse插件,并没有为我们提供Filter的新建功能,为此我们不得不每次都去新建个类,然后输入那繁琐的重复代码,这完全就是浪费时间,时间应该花在更有用的事情上,而不是这类重复操作,象下面这些内容如果要自己来写,完全时浪费时间,我们完全可以创建一个模板来让它自动帮我们完成以下内容

Java代码

1. package test; 
2.  
3. import java.io.IOException; 
4. import javax.servlet.FilterChain; 
5. import javax.servlet.FilterConfig; 
6. import javax.servlet.ServletException; 
7. import javax.servlet.ServletRequest; 
8. import javax.servlet.ServletResponse; 
9. import javax.servlet.Filter; 
10. import javax.servlet.http.HttpServletRequest; 
11. import javax.servlet.http.HttpServletResponse; 
12. import javax.servlet.http.HttpSession; 
13.  
14. publicclass FilterTemplateimplements Filter 
15.     { 
16.  
17.     /**
18.      * Constructor of the object.
19.      */ 
20.     public FilterTemplate() 
21.         { 
22.         super(); 
23.         } 
24.  
25.     private FilterConfig filterConfig; 
26.  
27.     // Handle the passed-in FilterConfig    
28.     publicvoid init(FilterConfig filterConfig)throws ServletException 
29.         { 
30.         this.filterConfig = filterConfig; 
31.         } 
32.  
33.     publicvoid doFilter(ServletRequest req, ServletResponse res, 
34.             FilterChain filterChain) 
35.  
36.         { 
37.         try 
38.             { 
39.             HttpServletRequest request = (HttpServletRequest) req; 
40.             HttpServletResponse response = (HttpServletResponse) res; 
41.             HttpSession session = request.getSession(); 
42.  
43.             // 这里放到达目的地前(进入)处理代码 
44.  
45.             filterChain.doFilter(req, res); 
46.  
47.             // 这里放到达目的地(离开)的处理代码 
48.  
49.             } 
50.         catch (IOException e) 
51.             { 
52.             e.printStackTrace(); 
53.             } 
54.         catch (ServletException e) 
55.             { 
56.             e.printStackTrace(); 
57.             } 
58.         } 
59.     /**
60.      * Destruction of the servlet. <br>
61.      */ 
62.     publicvoid destroy() 
63.         { 
64.         // Just puts "destroy" string in log 
65.         // Put your code here 
66.         } 
67.  
68.     } 

package test;import java.io.IOException;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.Filter;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;public class FilterTemplate implements Filter{/** * Constructor of the object. */public FilterTemplate(){super();}private FilterConfig filterConfig;// Handle the passed-in FilterConfigpublic void init(FilterConfig filterConfig) throws ServletException{this.filterConfig = filterConfig;}public void doFilter(ServletRequest req, ServletResponse res,FilterChain filterChain){try{HttpServletRequest request = (HttpServletRequest) req;HttpServletResponse response = (HttpServletResponse) res;HttpSession session = request.getSession();// 这里放到达目的地前(进入)处理代码filterChain.doFilter(req, res);// 这里放到达目的地(离开)的处理代码}catch (IOException e){e.printStackTrace();}catch (ServletException e){e.printStackTrace();}}/** * Destruction of the servlet. <br> */public void destroy(){// Just puts "destroy" string in log// Put your code here}}

打开Eclipse,选择首选相,然后根据图片提示操作

Java代码

1. package ${enclosing_package} ; 
2.  
3. import java.io.IOException; 
4. import javax.servlet.FilterChain; 
5. import javax.servlet.FilterConfig; 
6. import javax.servlet.ServletException; 
7. import javax.servlet.ServletRequest; 
8. import javax.servlet.ServletResponse; 
9. import javax.servlet.Filter; 
10. import javax.servlet.http.HttpServletRequest; 
11. import javax.servlet.http.HttpServletResponse; 
12. import javax.servlet.http.HttpSession; 
13.  
14. publicclass ${primary_type_name}implements Filter 
15.     { 
16.  
17.     /**
18.      * Constructor of the object.
19.      */ 
20.     public ${primary_type_name}() 
21.         { 
22.         super(); 
23.         } 
24.  
25.      
26.     private FilterConfig filterConfig; 
27.  
28.     // Handle the passed-in FilterConfig    
29.     publicvoid init(FilterConfig filterConfig)throws ServletException 
30.         { 
31.         this.filterConfig = filterConfig; 
32.         } 
33.  
34.     publicvoid doFilter(ServletRequest req, ServletResponse res, FilterChain filterChain) 
35.  
36.         { 
37.         try 
38.             { 
39.             HttpServletRequest request = (HttpServletRequest) req; 
40.             HttpServletResponse response = (HttpServletResponse) res; 
41.             HttpSession session = request.getSession(); 
42.              
43.             // 这里放到达目的地前(进入)处理代码 
44.              
45.              
46.             filterChain.doFilter(req,res); 
47.              
48.             // 这里放到达目的地(离开)的处理代码 
49.              
50.             } catch (IOException e) 
51.             { 
52.             e.printStackTrace(); 
53.             } catch (ServletException e) 
54.             { 
55.             e.printStackTrace(); 
56.             } 
57.         } 
58.     /**
59.      * Destruction of the servlet. <br>
60.      */ 
61.     publicvoid destroy() 
62.         { 
63.         // Just puts "destroy" string in log 
64.         // Put your code here 
65.         } 
66.  
67.     } 

package ${enclosing_package} ;import java.io.IOException;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.Filter;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;public class ${primary_type_name} implements Filter{/** * Constructor of the object. */public ${primary_type_name}(){super();}private FilterConfig filterConfig;// Handle the passed-in FilterConfigpublic void init(FilterConfig filterConfig) throws ServletException{this.filterConfig = filterConfig;}public void doFilter(ServletRequest req, ServletResponse res, FilterChain filterChain){try{HttpServletRequest request = (HttpServletRequest) req;HttpServletResponse response = (HttpServletResponse) res;HttpSession session = request.getSession();// 这里放到达目的地前(进入)处理代码filterChain.doFilter(req,res);// 这里放到达目的地(离开)的处理代码} catch (IOException e){e.printStackTrace();} catch (ServletException e){e.printStackTrace();}}/** * Destruction of the servlet. <br> */public void destroy(){// Just puts "destroy" string in log// Put your code here}}

代码中有两处变量

${enclosing_package}  外层包名
${primary_type_name}  不带扩展名的文件名



用图片结合代码那两个变量的意思就很明显了,因为模板里其它部分是死的,就只有包和类名是活的,所以需要动态的生成

接下来就是使用这个模板了
我们只需要新建一个class(任意包下都无所谓),然后Ctrl+A全选,接着delete,在编辑器中输入filter,按Alt+/(代码辅助快捷键),选择filter - filter模板(注意,如果filter只有单一辅助内容,不会提示图中的框,会把唯一的内容直接输出到编辑器,你可以只输入f,然后Alt+/)




接着我们打开web.xml加入相应的配置信息,如果你觉得配置信息也麻烦(毕竟最少都有8行),完全可以在xml编辑器下也创建模板,由于xml编辑器不是eclipse默认提供,而是通过插件提供的,所以我们要到相应插件的选相下去修改,笔者使用的是myeclipse的xml编辑器,所以是在首选相下的myeclipse里,见下图





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接下来我们来打开web.xml,然后在web-app标签中间空白处输入filter然后alt+/,就会出现filter 模板提示,见下图



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注意一点: 由于xml编辑器不是eclipse默认提供,而是通过插件提供的,所以我们要到相应插件的选相下去修改,那么你打开xml时就要使用你定义了模板的编辑器来打开
具体说明参见下图



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-

除了上面的例子,模板还可以用在其它很多地方,只要是出现频率高的重复操作,我们都可以定义一个模板来完成,这样可以节省我们宝贵的时间来做其它有意义的事情