Spring Controller 如何对不同对象中相同的属性名注入不同的值

Spring MVC开发当中，有时候需要对不同对象中相同的属性名注入不同的值。通过下面自定义注解代码可解决问题。

 

新建注解类

[java] view plaincopy

1. package com.cdt.uums.spring.resolver;  
2.   
3. import java.lang.annotation.Documented;  
4. import java.lang.annotation.ElementType;  
5. import java.lang.annotation.Retention;  
6. import java.lang.annotation.RetentionPolicy;  
7. import java.lang.annotation.Target;  
8.   
9.   
10. @Target(ElementType.PARAMETER)  
11. @Retention(RetentionPolicy.RUNTIME)  
12. @Documented  
13. public @interface RequestBean {  
14.     String value() default "_def_param_name";  
15. }  

自定义注解类

 

[java] view plaincopy

1. package com.cdt.uums.spring.resolver;  
2.   
3. import java.text.SimpleDateFormat;  
4. import java.util.Date;  
5. import java.util.HashMap;  
6. import java.util.Iterator;  
7.   
8. import org.springframework.beans.BeanWrapper;  
9. import org.springframework.beans.BeanWrapperImpl;  
10. import org.springframework.beans.propertyeditors.CustomDateEditor;  
11. import org.springframework.core.MethodParameter;  
12. import org.springframework.web.bind.support.WebArgumentResolver;  
13. import org.springframework.web.context.request.NativeWebRequest;  
14.   
15. public class BeanArgumentResolver implements WebArgumentResolver {  
16.   
17.     @SuppressWarnings("rawtypes")  
18.     public Object resolveArgument(MethodParameter param, NativeWebRequest request) throws Exception {  
19.         RequestBean requestBean = param.getParameterAnnotation(RequestBean.class);  
20.           
21.         if (requestBean != null) {  
22.             String _param = requestBean.value();  
23.             if (_param.equals("_def_param_name")) {  
24.                 _param = param.getParameterName();  
25.             }  
26.             Class clazz = param.getParameterType();  
27.             Object object = clazz.newInstance();  
28.             HashMap<String, String[]> paramsMap = new HashMap<String, String[]>();  
29.             Iterator<String> itor = request.getParameterNames();  
30.             while (itor.hasNext()) {  
31.                 String webParam = (String) itor.next();  
32.                 String[] webValue = request.getParameterValues(webParam);  
33.                 if (webParam.startsWith(_param)) {  
34.                     paramsMap.put(webParam, webValue);  
35.                 }  
36.             }  
37.             BeanWrapper obj = new BeanWrapperImpl(object);  
38.             //obj.findCustomEditor(paramClass, paramString)  
39.             obj.registerCustomEditor(Date.class, null, new CustomDateEditor(new SimpleDateFormat("yyyy-MM-dd"), true));  
40.             //WebDataBinder.  
41.             System.out.println(obj.findCustomEditor(Date.class, null).getAsText());  
42.               
43.             for (String propName : paramsMap.keySet()) {  
44.                 String[] propVals = paramsMap.get(propName);  
45.                 String[] props = propName.split("\\.");  
46.                 if (props.length == 2) {  
47.                     obj.setPropertyValue(props[1], propVals);  
48.                 } else if (props.length == 3) {  
49.                     Object tmpObj = obj.getPropertyValue(props[1]);  
50.                     if (tmpObj == null)  
51.                         obj.setPropertyValue(props[1], obj.getPropertyType(props[1]).newInstance());  
52.                     obj.setPropertyValue(props[1] + "." + props[2], propVals);  
53.                 }  
54.   
55.             }  
56.             /* 
57.              * Field[] fields = clazz.getDeclaredFields(); for(Field 
58.              * field:fields){ obj.setPropertyValue(field.getName(), 
59.              * paramsMap.get(_param +"."+field.getName())); } 
60.              *  
61.              * for(String porpName:paramsMap.keySet()){ String[] params = 
62.              * paramsMap.get(porpName); if (null != params) { Object 
63.              * field=obj.getPropertyValue(porpName.replaceFirst(_param+".", 
64.              * "")); Class 
65.              * clz=obj.getPropertyType(porpName.replaceFirst(_param+".", "")); 
66.              * System.out.println(porpName.replaceFirst(_param+".", 
67.              * "")+":"+field+" "+clz); if(field==null){ 
68.              * //field=obj.getPropertyType(porpName.replaceFirst(_param+".", 
69.              * "")).newInstance(); } 
70.              * obj.setPropertyValue(porpName.replaceFirst(_param+".", ""), 
71.              * params); } } 
72.              */  
73.             /* 
74.              * Method[] methods = clazz.getMethods(); for (Method m : methods) { 
75.              * Class[] parClazzs = m.getParameterTypes(); String methodName = 
76.              * m.getName(); if (parClazzs.length == 1 && 
77.              * methodName.startsWith("set")) { 
78.              *  
79.              * String[] params = paramsMap.get(_param + 
80.              * methodName.toLowerCase().replace("set", ".")); 
81.              *  
82.              * if (parClazzs[0].equals(String.class)) { if (null != params) { 
83.              * m.invoke(object, new Object[] { params[0] }); } } else if 
84.              * (parClazzs[0].equals(String[].class)) { if (null != params) { 
85.              * m.invoke(object, new Object[] { params }); } } } 
86.              *  
87.              * } 
88.              */  
89.             return object;  
90.         } else {  
91.             return WebArgumentResolver.UNRESOLVED;  
92.         }  
93.     }  
94. }  

 

JSP页面

    <input name="committeeInfo.committeeName" id="committeeInfo.committeeName" value=""/>

Spring 控制器中可通过@RequestBean("committeeInfo") CommitteeInfo committeeInfo的方式接收值.