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Apache CXF实战之八 Map类型绑定

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本文链接：http://blog.csdn.net/kongxx/article/details/7544640

Apache CXF实战之一 Hello World Web Service

Apache CXF实战之二 集成Sping与Web容器

Apache CXF实战之三 传输Java对象

Apache CXF实战之四 构建RESTful Web Service

Apache CXF实战之五 压缩Web Service数据

Apache CXF实战之六 创建安全的Web Service

Apache CXF实战之七 使用Web Service传输文件

在CXF中，如果Web Service返回类型是Map的时候，比如方法签名如下

[java] view plaincopyprint?
  1. @WebMethod
  2. @WebResult Map<String, User> getUserMap();
此时如果运行程序会得到类似下面的异常
[java] view plaincopyprint?
  1. ...
  2. Caused by: com.sun.xml.bind.v2.runtime.IllegalAnnotationsException: 2 counts of IllegalAnnotationExceptions
  3. java.util.Map is an interface, and JAXB can't handle interfaces.
  4. this problem is related to the following location:
  5. at java.util.Map
  6. at private java.util.Map com.googlecode.garbagecan.cxfstudy.type.sample2.jaxws_asm.GetUserMapResponse._return
  7. at com.googlecode.garbagecan.cxfstudy.type.sample2.jaxws_asm.GetUserMapResponse
  8. java.util.Map does not have a no-arg default constructor.
  9. this problem is related to the following location:
  10. at java.util.Map
  11. at private java.util.Map com.googlecode.garbagecan.cxfstudy.type.sample2.jaxws_asm.GetUserMapResponse._return
  12. at com.googlecode.garbagecan.cxfstudy.type.sample2.jaxws_asm.GetUserMapResponse
  13. at com.sun.xml.bind.v2.runtime.IllegalAnnotationsException$Builder.check(IllegalAnnotationsException.java:102)
  14. at com.sun.xml.bind.v2.runtime.JAXBContextImpl.getTypeInfoSet(JAXBContextImpl.java:472)
  15. at com.sun.xml.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:302)
  16. at com.sun.xml.bind.v2.runtime.JAXBContextImpl$JAXBContextBuilder.build(JAXBContextImpl.java:1136)
  17. at com.sun.xml.bind.v2.ContextFactory.createContext(ContextFactory.java:154)
  18. at com.sun.xml.bind.v2.ContextFactory.createContext(ContextFactory.java:121)
  19. at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  20. at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
  21. at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
  22. at java.lang.reflect.Method.invoke(Unknown Source)
  23. at javax.xml.bind.ContextFinder.newInstance(Unknown Source)
  24. at javax.xml.bind.ContextFinder.newInstance(Unknown Source)
  25. at javax.xml.bind.ContextFinder.find(Unknown Source)
  26. at javax.xml.bind.JAXBContext.newInstance(Unknown Source)
  27. at org.apache.cxf.jaxb.JAXBDataBinding.createContext(JAXBDataBinding.java:560)
  28. at org.apache.cxf.jaxb.JAXBDataBinding.createJAXBContextAndSchemas(JAXBDataBinding.java:500)
  29. at org.apache.cxf.jaxb.JAXBDataBinding.initialize(JAXBDataBinding.java:320)
  30. ... 25 more
  31. ...
如果把方法签名改为如下时

[java] view plaincopyprint?
  1. @WebMethod
  2. @WebResult HashMap<String, User> getUserMap();
运行程序会发现返回的结果总是一个空的HashMap。


对于以上问题，此时需要对Map类型做一下数据绑定或者说转换，看下面详细例子

1. 首先是一个实体类

[java] view plaincopyprint?
  1. package com.googlecode.garbagecan.cxfstudy.type.sample2;
  3. public class User {
  4. private String id;
  5. private String name;
  6. private String password;
  7. public String getId() {
  8. return id;
  9. }
  10. public void setId(String id) {
  11. this.id = id;
  12. }
  13. public String getName() {
  14. return name;
  15. }
  16. public void setName(String name) {
  17. this.name = name;
  18. }
  19. public String getPassword() {
  20. return password;
  21. }
  22. public void setPassword(String password) {
  23. this.password = password;
  24. }
  25. }
2. 对Map类型做转换的类和适配器类

[java] view plaincopyprint?
  1. package com.googlecode.garbagecan.cxfstudy.type.sample2;
  3. import java.util.HashMap;
  4. import java.util.Map;
  6. import javax.xml.bind.annotation.adapters.XmlAdapter;
  8. public class MapAdapterextends XmlAdapter<MapConvertor, Map<String, Object>> {
  10. @Override
  11. public MapConvertor marshal(Map<String, Object> map)throws Exception {
  12. MapConvertor convertor = new MapConvertor();
  13. for (Map.Entry<String, Object> entry : map.entrySet()) {
  14. MapConvertor.MapEntry e = new MapConvertor.MapEntry(entry);
  15. convertor.addEntry(e);
  16. }
  17. return convertor;
  18. }
  20. @Override
  21. public Map<String, Object> unmarshal(MapConvertor map)throws Exception {
  22. Map<String, Object> result = new HashMap<String, Object>();
  23. for (MapConvertor.MapEntry e : map.getEntries()) {
  24. result.put(e.getKey(), e.getValue());
  25. }
  26. return result;
  27. }
  28. }
  30. package com.googlecode.garbagecan.cxfstudy.type.sample2;
  32. import java.util.ArrayList;
  33. import java.util.List;
  34. import java.util.Map;
  36. import javax.xml.bind.annotation.XmlAccessType;
  37. import javax.xml.bind.annotation.XmlAccessorType;
  38. import javax.xml.bind.annotation.XmlType;
  40. @XmlType(name = "MapConvertor")
  41. @XmlAccessorType(XmlAccessType.FIELD)
  42. public class MapConvertor {
  43. private List<MapEntry> entries = new ArrayList<MapEntry>();
  45. public void addEntry(MapEntry entry) {
  46. entries.add(entry);
  47. }
  49. public List<MapEntry> getEntries() {
  50. return entries;
  51. }
  53. public staticclass MapEntry {
  55. private String key;
  57. private Object value;
  59. public MapEntry() {
  60. super();
  61. }
  63. public MapEntry(Map.Entry<String, Object> entry) {
  64. super();
  65. this.key = entry.getKey();
  66. this.value = entry.getValue();
  67. }
  69. public MapEntry(String key, Object value) {
  70. super();
  71. this.key = key;
  72. this.value = value;
  73. }
  75. public String getKey() {
  76. return key;
  77. }
  79. public void setKey(String key) {
  80. this.key = key;
  81. }
  83. public Object getValue() {
  84. return value;
  85. }
  87. public void setValue(Object value) {
  88. this.value = value;
  89. }
  90. }
  91. }
3. 下面是WebService接口类，注意其中的@XmlJavaTypeAdapter注解部分

[java] view plaincopyprint?
  1. package com.googlecode.garbagecan.cxfstudy.type.sample2;
  3. import java.util.List;
  4. import java.util.Map;
  6. import javax.jws.WebMethod;
  7. import javax.jws.WebResult;
  8. import javax.jws.WebService;
  9. import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
  11. @WebService
  12. public interface UserService {
  14. @WebMethod
  15. @WebResult List<User> getUserList();
  17. @WebMethod
  18. @XmlJavaTypeAdapter(MapAdapter.class)
  19. @WebResult Map<String, User> getUserMap();
  20. }
4. WebService接口实现类

[java] view plaincopyprint?
  1. package com.googlecode.garbagecan.cxfstudy.type.sample2;
  3. import java.util.ArrayList;
  4. import java.util.LinkedHashMap;
  5. import java.util.List;
  6. import java.util.Map;
  8. public class UserServiceImplimplements UserService {
  10. public List<User> getUserList() {
  11. List<User> userList = new ArrayList<User>();
  12. for (int i = 0; i < 10; i++) {
  13. User user = new User();
  14. user.setId("" + i);
  15. user.setName("user_" + i);
  16. user.setPassword("password_" + i);
  17. userList.add(user);
  18. }
  19. return userList;
  20. }
  22. public Map<String, User> getUserMap() {
  23. Map<String, User> userMap = new LinkedHashMap<String, User>();
  24. for (int i = 0; i < 10; i++) {
  25. User user = new User();
  26. user.setId("" + i);
  27. user.setName("user_" + i);
  28. user.setPassword("password_" + i);
  29. userMap.put(user.getId(), user);
  30. }
  31. return userMap;
  32. }
  33. }
5. 最后是一个单元测试类

[java] view plaincopyprint?
  1. package com.googlecode.garbagecan.cxfstudy.type.sample2;
  3. import java.util.List;
  4. import java.util.Map;
  6. import javax.xml.ws.Endpoint;
  8. import org.apache.cxf.jaxws.JaxWsProxyFactoryBean;
  9. import org.junit.After;
  10. import org.junit.Assert;
  11. import org.junit.Before;
  12. import org.junit.BeforeClass;
  13. import org.junit.Test;
  15. public class UserServiceTest {
  17. private staticfinal String address = "http://localhost:9000/ws/type/sample2/userService";
  19. private UserService userService;
  21. @BeforeClass
  22. public static void setUpBeforeClass() throws Exception {
  23. Endpoint.publish(address, new UserServiceImpl());
  24. }
  26. @Before
  27. public void setUp()throws Exception {
  28. JaxWsProxyFactoryBean factoryBean = new JaxWsProxyFactoryBean();
  29. factoryBean.setAddress(address);
  30. factoryBean.setServiceClass(UserService.class);
  31. Object obj = factoryBean.create();
  32. userService = (UserService)obj;
  33. }
  35. @After
  36. public void tearDown()throws Exception {
  37. userService = null;
  38. }
  40. @Test
  41. public void testGetUserList() {
  42. Assert.assertNotNull(userService);
  43. List<User> users = userService.getUserList();
  44. Assert.assertNotNull(users);
  45. Assert.assertEquals(10, users.size());
  46. }
  48. @Test
  49. public void testGetUserMap() {
  50. Assert.assertNotNull(userService);
  51. Map<String, User> users = userService.getUserMap();
  52. Assert.assertNotNull(users);
  53. Assert.assertEquals(10, users.size());
  54. }
  56. }
6. 运行单元测试类验证上面的实现。
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