If you finding trouble making json response in your spring project, Please find below simple steps to do that,
Step 01
Add below code snippets in your pom.xml file
<!-- Jackson JSON Mapper -->
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.13</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.4.1</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.4.1.1</version>
</dependency>
Step 02
Add below code in you spring configuration xml file
<!-- Configure to plugin JSON as request and response in method handler --> <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
<property name="messageConverters">
<list>
<ref bean="jsonMessageConverter"/>
</list>
</property>
</bean>
<!-- Configure bean to convert JSON to POJO and vice versa -->
<bean id="jsonMessageConverter" class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"></bean>
Step 03:
Below is the simple example of a controller methode which convert SystemUser Java entity class map returns as a json.
@RequestMapping(value="getSystemUser", method=RequestMethod.GET)
public @ResponseBody Map<String, Object> getSystemUser(@RequestParam("userId") long userId, HttpServletRequest request){
SystemUser systemUser = systemUserService.getSystemUser(userId);
return systemUser.toMap();
}
If you want to refer my SystemUser object , please find it below.
package com.isd.sappu.savari.domains;
import java.io.Serializable;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import org.hibernate.annotations.Cascade;
import org.hibernate.annotations.CascadeType;
@Entity
@Table(name="users")
public class SystemUser implements Serializable{
private static final long serialVersionUID = 5489679679570043539L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private long userId;
private String username;
private String password;
private String firstName;
private String lastName;
private String address;
private String profilePic;
private Date dateOfBirth;
private String mobileNo;
private String workNo;
private String homeNo;
private double latitude;
private double longtitude;
private int accuracy;
private int activeStatus;
@OneToMany(mappedBy="user")
@Cascade(CascadeType.ALL)
private List<Favorite> favoriteList;
@OneToMany(mappedBy="user")
@Cascade(CascadeType.ALL)
private List<Comment> commentList;
@OneToMany(mappedBy="user")
@Cascade(CascadeType.ALL)
private List<Rating> ratingList;
@OneToMany(mappedBy="sender")
@Cascade(CascadeType.ALL)
private List<Message> messageSentList;
@OneToMany(mappedBy="receiver")
@Cascade(CascadeType.ALL)
private List<Message> messageRecievedList;
@OneToMany(mappedBy="user")
@Cascade(CascadeType.ALL)
private List<Product> productList;
@OneToMany(mappedBy="user")
@Cascade(CascadeType.ALL)
private List<SystemUserRole> systemUserRoleList;
@OneToMany(mappedBy="user")
@Cascade(CascadeType.ALL)
private List<SearchRequest> searchRequestList;
public long getUserId() {
return userId;
}
public void setUserId(long userId) {
this.userId = userId;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getProfilePic() {
return profilePic;
}
public void setProfilePic(String profilePic) {
this.profilePic = profilePic;
}
public Date getDateOfBirth() {
return dateOfBirth;
}
public void setDateOfBirth(Date dateOfBirth) {
this.dateOfBirth = dateOfBirth;
}
public String getMobileNo() {
return mobileNo;
}
public void setMobileNo(String mobileNo) {
this.mobileNo = mobileNo;
}
public String getWorkNo() {
return workNo;
}
public void setWorkNo(String workNo) {
this.workNo = workNo;
}
public String getHomeNo() {
return homeNo;
}
public void setHomeNo(String homeNo) {
this.homeNo = homeNo;
}
public List<Favorite> getFavoriteList() {
return favoriteList;
}
public void setFavoriteList(List<Favorite> favoriteList) {
this.favoriteList = favoriteList;
}
public List<Comment> getCommentList() {
return commentList;
}
public void setCommentList(List<Comment> commentList) {
this.commentList = commentList;
}
public List<Rating> getRatingList() {
return ratingList;
}
public void setRatingList(List<Rating> ratingList) {
this.ratingList = ratingList;
}
public List<Message> getMessageSentList() {
return messageSentList;
}
public void setMessageSentList(List<Message> messageSentList) {
this.messageSentList = messageSentList;
}
public List<Message> getMessageRecievedList() {
return messageRecievedList;
}
public void setMessageRecievedList(List<Message> messageRecievedList) {
this.messageRecievedList = messageRecievedList;
}
public List<Product> getProductList() {
return productList;
}
public void setProductList(List<Product> productList) {
this.productList = productList;
}
public List<SystemUserRole> getSystemUserRoleList() {
return systemUserRoleList;
}
public void setSystemUserRoleList(List<SystemUserRole> systemUserRoleList) {
this.systemUserRoleList = systemUserRoleList;
}
public int getActiveStatus() {
return activeStatus;
}
public void setActiveStatus(int activeStatus) {
this.activeStatus = activeStatus;
}
public List<SearchRequest> getSearchRequestList() {
return searchRequestList;
}
public void setSearchRequestList(List<SearchRequest> searchRequestList) {
this.searchRequestList = searchRequestList;
}
public double getLatitude() {
return latitude;
}
public void setLatitude(double latitude) {
this.latitude = latitude;
}
public double getLongtitude() {
return longtitude;
}
public void setLongtitude(double longtitude) {
this.longtitude = longtitude;
}
public int getAccuracy() {
return accuracy;
}
public void setAccuracy(int accuracy) {
this.accuracy = accuracy;
}
public Map<String, Object> toMap() {
Map<String, Object> map = new HashMap<String, Object>();
map.put("userId", userId);
map.put("username", username);
map.put("address", address);
map.put("mobileNo", mobileNo);
map.put("latitude", latitude);
map.put("longtitude", longtitude);
map.put("accuracy", accuracy);
map.put("activeStatus", activeStatus);
return map;
}
}
That’s all, Enjoy your json experience.
Thank you…!!!
Java Source Point 