一、目标
增加filterchain功能
二、代码
1.Filter.java
1 public interface Filter {
2 public String doFilter(String str);
3 }
2.FilterChain.java
1 import java.util.ArrayList;
2 import java.util.List;
3
4 public class FilterChain implements Filter {
5
6 private List<Filter> filters = new ArrayList<Filter>();
7
8 public String doFilter(String str) {
9 for(Filter f : filters){
10 str = f.doFilter(str);
11 }
12 return str;
13 }
14
15 //把函数的返回值设为FilterChain，返回this,就能方便链式编写代码
16 public FilterChain addFilter(Filter filter) {
17 filters.add(filter);
18 return this;
19 }
20
21 }
3.HTMLFilter.java
1 public class HTMLFilter implements Filter {
2
3 @Override
4 public String doFilter(String str) {
5 return str.replace(‘<‘, ‘[‘).replace(">", "]");
6 }
7
8 }
4.SensitiveFilter.java
1 public class SensitiveFilter implements Filter {
2
3 @Override
4 public String doFilter(String str) {
5 return str.replace("敏感", "幸福");
6 }
7
8 }
5.MsgProcessor.java
1 public class MsgProcessor {
2
3 //private List<Filter> filters = new ArrayList<Filter>();
4 FilterChain filterChain;
5 private String msg;
6
7 public FilterChain getFilterChain() {
8 return filterChain;
9 }
10
11 public void setFilterChain(FilterChain filterChain) {
12 this.filterChain = filterChain;
13 }
14
15
16 public String getMsg() {
17 return msg;
18 }
19
20 public void setMsg(String msg) {
21 this.msg = msg;
22 }
23
24 public String process() {
25 return filterChain.doFilter(msg);
26 }
27 }
6.Test.java
1 public class Test {
2
3 @org.junit.Test
4 public void testFilter(){
5
6 MsgProcessor processor = new MsgProcessor();
7
8 String msg = "<html>敏感字眼</html>";
9 processor.setMsg(msg);
10
11 FilterChain fc1 = new FilterChain();
12 fc1.addFilter(new HTMLFilter());
13
14 FilterChain fc2 = new FilterChain();
15 fc2.addFilter(new SensitiveFilter());
16
17 //由于FilterChain实现了Filter接口，所以FilterChain同时也是Filter,所以可以调用addFilter增加fc2
18 fc1.addFilter(fc2);
19
20 processor.setFilterChain(fc1);
21
22 String result = processor.process();
23 System.out.println(result);
24
25 }
26
27 }
三、运行结果
时间： 2024-11-08 10:31:43