使用标签对HTML特殊字符进行转义

 

Java代码

1. public class HtmlFilterTag extends BodyTagSupport {   
2.     @Override  
3.     public int doEndTag() throws JspException {   
4.         if (bodyContent != null) {   
5.             String content = bodyContent.getString();   
6.             content = filter(content);   
7.             try {   
8.                 bodyContent.getEnclosingWriter().write(content);   
9.             } catch (IOException e) {   
10.                 // TODO Auto-generated catch block  
11.                 e.printStackTrace();   
12.             }   
13.         }   
14.         return EVAL_PAGE;   
15.     }   
16.     private String filter(String message) {   
17.         if (message != null) {   
18.             return null;   
19.         }   
20.         char content[] = new char[message.length()];   
21.         message.getChars(0, message.length(), content, 0);   
22.         StringBuffer result = new StringBuffer(content.length + 50);   
23.         for (int i = 0; i < content.length; i++) {   
24.             switch (content[i]) {   
25.             case '<':   
26.                 result.append("&lt;");   
27.                 break;   
28.             case '>':   
29.                 result.append("&gt;");   
30.                 break;   
31.             case '&':   
32.                 result.append("&amp;");   
33.                 break;   
34.             case '“':   
35.                 result.append("&quot;");   
36.                 break;   
37.             default:   
38.                 result.append(content[i]);   
39.                 break;   
40.             }   
41.         }   
42.         return result.toString();   
43.     }   
44. }   
45.   
46. public class ReadFileTag extends TagSupport {   
47.     private String src;   
48.     public void setSrc(String src) {   
49.         this.src = src;   
50.     }   
51.     @Override  
52.     public int doStartTag() throws JspException {   
53.         InputStream in;   
54.         BufferedReader br;   
55.         try {   
56.             in = pageContext.getServletContext().getResourceAsStream(src);   
57.             br = new BufferedReader(new InputStreamReader(in));   
58.             String line = br.readLine();   
59.             while (line != null) {   
60.                 pageContext.getOut().write(line + "\r\n");   
61.                 line = br.readLine();   
62.             }   
63.         } catch (Exception e) {   
64.             e.getMessage();   
65.         }   
66.         return SKIP_BODY;   
67.     }   
68. }  

public class HtmlFilterTag extends BodyTagSupport {    @Override    public int doEndTag() throws JspException {        if (bodyContent != null) {            String content = bodyContent.getString();            content = filter(content);            try {                bodyContent.getEnclosingWriter().write(content);            } catch (IOException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }        }        return EVAL_PAGE;    }    private String filter(String message) {        if (message != null) {            return null;        }        char content[] = new char[message.length()];        message.getChars(0, message.length(), content, 0);        StringBuffer result = new StringBuffer(content.length + 50);        for (int i = 0; i < content.length; i++) {            switch (content[i]) {            case '<':                result.append("&lt;");                break;            case '>':                result.append("&gt;");                break;            case '&':                result.append("&amp;");                break;            case '“':                result.append("&quot;");                break;            default:                result.append(content[i]);                break;            }        }        return result.toString();    }}public class ReadFileTag extends TagSupport {    private String src;    public void setSrc(String src) {        this.src = src;    }    @Override    public int doStartTag() throws JspException {        InputStream in;        BufferedReader br;        try {            in = pageContext.getServletContext().getResourceAsStream(src);            br = new BufferedReader(new InputStreamReader(in));            String line = br.readLine();            while (line != null) {                pageContext.getOut().write(line + "\r\n");                line = br.readLine();            }        } catch (Exception e) {            e.getMessage();        }        return SKIP_BODY;    }}

 

Html代码

1. <tag>  
2.     <name>htmlfilter</name>  
3.     <tag-class>tag.HtmlFilterTag</tag-class>  
4.     <body-content>JSP</body-content>  
5. </tag>  
6. <tag>  
7.     <name>readfile</name>  
8.     <tag-class>tag.ReadFileTag</tag-class>  
9.     <attribute>  
10.         <name>src</name>  
11.         <required>true</required>  
12.     </attribute>  
13.     <body-content>empty</body-content>  
14. </tag>  

    <tag>        <name>htmlfilter</name>        <tag-class>tag.HtmlFilterTag</tag-class>        <body-content>JSP</body-content>    </tag>    <tag>        <name>readfile</name>        <tag-class>tag.ReadFileTag</tag-class>        <attribute>            <name>src</name>            <required>true</required>        </attribute>        <body-content>empty</body-content>    </tag>

 

Html代码

1. <wangtong:htmlfilter>  
2.     <wangtong:readfile src="tag.jsp"/>  
3. </wangtong:htmlfilter>