Struts2自定義類型轉(zhuǎn)換器配置

鷹皇軟件 2014-01-15

展開全文

類型轉(zhuǎn)換分兩類

1 局部類型轉(zhuǎn)換
1.1 普通Action中的類型轉(zhuǎn)換
配置文件存放目錄：Action同級目錄；
配置文件名：Action名-conversion.properties文件
轉(zhuǎn)換器：自定義轉(zhuǎn)換器實現(xiàn)TypeConverter接口，可以直接繼承StrutsTypeConverter來實現(xiàn)；
內(nèi)容：Action屬性名=轉(zhuǎn)換器包路徑

1.2 基于模型驅(qū)動的類型轉(zhuǎn)換
配置文件存放目錄：模型同級目錄；
配置文件名：模型名-conversion.properties文件
轉(zhuǎn)換器：自定義轉(zhuǎn)換器實現(xiàn)TypeConverter接口，可以直接繼承StrutsTypeConverter來實現(xiàn)；
內(nèi)容：模型屬性名=轉(zhuǎn)換器包路徑

2 全局類型轉(zhuǎn)換
配置文件存放目錄：項目根目錄；
配置文件名：work-conversion.properties文件
轉(zhuǎn)換器：自定義轉(zhuǎn)換器實現(xiàn)TypeConverter接口，可以直接繼承StrutsTypeConverter來實現(xiàn)；
內(nèi)容：要轉(zhuǎn)換的類型包路徑=轉(zhuǎn)換器包路徑

注意：若在模型驅(qū)動情況下，即配置了Action的類型轉(zhuǎn)換器又配置了對應(yīng)模型的轉(zhuǎn)換器，此時只會選擇模型轉(zhuǎn)換器；

3 示例

3.1 模型驅(qū)動情況示例

[TestAction.java]

package com.struts2.demo;

import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
import com.struts2.demo.bean.TestBean;

public class TestAction extends ActionSupport implements ModelDriven{

private static final long serialVersionUID = -3557249908855957132L;

private TestBean bean = new TestBean();

public TestBean getBean() {
return bean;
}

public void setBean(TestBean bean) {
this.bean = bean;
}

public String input() throws Exception {
  return "input";
}

public String execute() throws Exception {
        return "success";
    }

public TestBean getModel() {
return this.bean;
}
}

[TestBean.java]

package com.struts2.demo.bean;

import java.math.BigDecimal;
import java.util.Date;

public class TestBean {
private String str;
private BigDecimal num;
private BigDecimal[] numArray;
private Date date;

public String getStr() {
return str;
}

public void setStr(String str) {
this.str = str;
}

public BigDecimal getNum() {
return num;
}

public void setNum(BigDecimal num) {
this.num = num;
}

public BigDecimal[] getNumArray() {
return numArray;
}

public void setNumArray(BigDecimal[] numArray) {
this.numArray = numArray;
}

public Date getDate() {
return date;
}

public void setDate(Date date) {
this.date = date;
}

}

[DateTypeConverter.java]

package com.struts2.demo;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Map;

import org.apache.struts2.util.StrutsTypeConverter;

public class DateTypeConverter extends StrutsTypeConverter {
// Ognl默認會轉(zhuǎn)換yyyy-MM-dd格式的日期；這里測試使用yyyyMMdd格式；
private static final SimpleDateFormat DEFAULT_FORMAT = new SimpleDateFormat("yyyyMMdd");

@Override
public Object convertFromString(Map context, String[] values, Class toClass) {
  if (values[0] == null || "".equals(values[0])) {
   return null;
  }

  Date result = null;
  try {
   if (toClass.equals(Date.class)) {
    result = DEFAULT_FORMAT.parse(values[0]);
   }
  } catch (ParseException e) {
   e.printStackTrace();
  }

  return result;
}

@Override
public String convertToString(Map context, Object o) {
  String result = "";
  if (o != null) {
   result = DEFAULT_FORMAT.format(o);
  }
  return result;
}
}

[demo.xml] include進struts.xml中；

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts./dtds/struts-2.0.dtd">

<action name="test_*" class="com.struts2.demo.TestAction" method="{1}">
 <result name="input">/WEB-INF/page/demo/input.jsp</result>
 <result name="success">/WEB-INF/page/demo/result.jsp</result>
 </action>

</package>
</struts>

[input.jsp]

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="s" uri="/struts-tags" %>

<html>
<head><title>demo input</title></head>
<body>
 <s:form namespace="/demo" action="test" method="post">
 str: <s:textfield name="str" /> 
 num: <s:textfield name="num" /> 
 numArray: <s:textfield name="numArray" value="%{numArray[0]}"/><s:textfield name="numArray" value="%{numArray[1]}"/> 
 date: <s:textfield name="date" /> 
 <s:submit value="提交"></s:submit>
 </s:form>
</body>
</html>

[result.jsp]

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="s" uri="/struts-tags" %>

<html>
<head><title>demo result</title></head>
<body>
 str: <s:property value="bean.str"/> 
 num: <s:property value="bean.num"/> 
 numArray: <s:iterator value="bean.numArray">
 <s:property />
 </s:iterator> 
 date: <s:property value="bean.date"/> 
</body>
</html>