response.setContentType()类型及解释

    response.setContentType(MIME)的作用是使客户端浏览器，区分不同种类的数据，并根据不同的MIME调用浏览器内不同的程序嵌入模块来处理相应的数据。

MIME类型：
    tomcat的安装目录\conf\web.xml定义了大量的类型，例如：
    <mime-mapping>
        <extension>html</extension>
        <mime-type>text/html</mime-type>html类型数据
    </mime-mapping>
    <mime-mapping>
        <extension>json</extension>
        <mime-type>application/json</mime-type>json格式数据
    </mime-mapping>
    <mime-mapping>
        <extension>text</extension>
        <mime-type>text/plain</mime-type>文本数据
    </mime-mapping>
    等等。。。。。

    response.setContentType("text/html");
    response.setCharacterEncoding("UTF-8");
    response.setHeader("Cache-Control", "no-cache");
    java.io.PrintWriter pw = null;  
    try{  
        pw = response.getWriter();  
        pw.write(print.get("result")); //将需要返回的数据 
    }catch (Exception e){  
        //   
    }finally{  
        pw.close();  
    }

常见ContentType类型：
<option   value="image/bmp">BMP</option>   
<option   value="image/gif">GIF</option>   
<option   value="image/jpeg">JPEG</option>   
<option   value="image/tiff">TIFF</option>   
<option   value="image/x-dcx">DCX</option>   
<option   value="image/x-pcx">PCX</option>   
<option   value="text/html">HTML</option>   
<option   value="text/plain">TXT</option>   
<option   value="text/xml">XML</option>   
<option   value="application/afp">AFP</option>   
<option   value="application/pdf">PDF</option>   
<option   value="application/rtf">RTF</option>   
<option   value="application/msword">MSWORD</option>   
<option   value="application/vnd.ms-excel">MSEXCEL</option>   
<option   value="application/vnd.ms-powerpoint">MSPOWERPOINT</option>   
<option   value="application/wordperfect5.1">WORDPERFECT</option>   
<option   value="application/vnd.lotus-wordpro">WORDPRO</option>   
<option   value="application/vnd.visio">VISIO</option>   
<option   value="application/vnd.framemaker">FRAMEMAKER</option>   
<option   value="application/vnd.lotus-1-2-3">LOTUS123</option>

引用于：http://blog.sina.com.cn/s/blog_a03d702f010143tw.html