Custom El expression, convert object to JSON format, key code

Source: Internet
Author: User
Tags tld

Do javaweb development of the most commonly used a thing El expression, this thing is a very useful thing, but sometimes we deal with complex string manipulation, it is a little bit, this time we need to use a custom method to achieve more concise and convenient things.

The following custom El expression that turns an object into a JSON string is used to illustrate this custom process:

Elfunctions.java

import net.sf.json.JSONObject;publicclass ElFunctions{    publicstatictoJsonString(Object obj){        // 将java对象转换为json对象        JSONObject json = JSONObject.fromObject(obj);        String str = json.toString();        return str;    }}

Mobai-el-common.tld

<?xml version= "1.0" encoding= "UTF-8"?><taglib xmlns="Http://java.sun.com/xml/ns/javaee" xmlns:xsi="http ://www.w3.org/2001/XMLSchema-instance "xsi:schemalocation=" Http://java.sun.com/xml/ns/javaee Http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2_1.xsd " version=" 2.1">        <tlib-version>1.0</tlib-version>    <short-name>El</short-name>    <!--format the object as a JSON string --    <function>        <name>toJSONString</name>        <function-class>Com.mobai.taglib.functions.ElFunctions</function-class>        <function-signature>String tojsonstring (Java.lang.Object)</function-signature>        <description>Format the object as a JSON string</Description>        <example>${el:tojsonstring (Value)}</Example>    </function></taglib>

Xml

<?xml version= "1.0" encoding= "UTF-8"?>  <web-app version="2.5" xmlns="Http://java.sun.com/xml/ns/javaee"  xmlns:xsi= "http://www.w3.org/2001/XMLSchema-instance"xsi:schemalocation=" Http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd ">                  <jsp-config>          <taglib>              <!--The reference address of the configuration label is referenced in the JSP page using the              <Taglib-uri>Mobai.com/el-common</Taglib-uri>              <!--configuration label TLD file address--              <taglib-location>/web-inf/mobai-el-common.tld</taglib-location>          </taglib>      </jsp-config>      <welcome-file-list>          <welcome-file>index.jsp</welcome-file>      </welcome-file-list>  </Web-app>

index.jsp

<%@ taglib uri="mobai.com/el-common" prefix="el" %><body>    ${el:toJsonString(user)}</body>  

The above is probably the key code of the function, here only a way to convert the JSON string, the others can be customized according to the needs of a variety of methods to use.

Custom El expression, convert object to JSON format, key code

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