struts2 spring json报JSONException

对于spring配置文件中定义的bean，在java代码中含有get方法而且struts中使用了json返回，而这个bean在转json中不用转成json，需要在它的get方法上加@JSON(serialize=false)，或者把get方法删除。否则会报org.apache.struts2.json.JSONException。

比如applicationContext.xml中有一个bean中含有jdbcTemplate属性，而example.TestAjax类中转json中不用转jdbcTemplate属性，则要在getJdbcTemplate()方法上加注解@JSON(serialize=false)，而属性s在类中不是bean的定义类型，则正常，下面执行结果中返回的object中包含了list和s，虽然s没有特意转成json。返回的object含有类中所有get方法返回的内容。

<bean id="a" class="example.TestAjax">
	<property name="jdbcTemplate" ref="jdbcTemplate" />
	<property name="s" value="test"/>
</bean>

example.TestAjax

package example;
import java.io.IOException;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import net.sf.json.JSONObject;

import org.apache.struts2.json.annotations.JSON;
import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowCallbackHandler;

import com.opensymphony.xwork2.ActionSupport;


public class TestAjax extends ActionSupport{
	
	private static final long serialVersionUID = 1L;
	private String result;
	private JdbcTemplate jdbcTemplate;
	private String s;
	
	public String getS() {
		return s;
	}

	public void setS(String s) {
		this.s = s;
	}

	public String ajaxMap(){
        Map<String, String> map = new HashMap<String, String>();  
        map.put("name", "Name");  
        JSONObject json = JSONObject.fromObject(map); 
		result = json.toString();
		return SUCCESS;
	}
	
	public String ajaxList() throws JsonGenerationException, JsonMappingException, IOException{
		String sql = "select * from user;";
		final List<User> list = new ArrayList<User>();
		jdbcTemplate.query(sql, new RowCallbackHandler(){
			@Override
			public void processRow(ResultSet arg0) throws SQLException {
				User u = new User(); 
				u.setName(arg0.getString("User"));
				u.setPassword(arg0.getString("Password"));
				list.add(u);
			}
		});
//		JSONObject obj = JSONObject.fromObject(l);
		//jackson
		ObjectMapper o = new ObjectMapper();
//		result = o.writeValueAsString(l);
		result = o.writeValueAsString(list);
		return SUCCESS;
	}
	
	public String getResult() {
		return result;
	}

	public void setResult(String result) {
		this.result = result;
	}
	
	// @JSON(serialize=false)不能少，不然返回json时会报错
	@JSON(serialize=false)
	public JdbcTemplate getJdbcTemplate() {
		return jdbcTemplate;
	}

	public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
		this.jdbcTemplate = jdbcTemplate;
	}

	//User要加public不然上面的转json会提示找不到set方法
	public class User{
		private String name;
		private String password;
		
		public String getName() {
			return name;
		}
		public void setName(String name) {
			this.name = name;
		}
		public String getPassword() {
			return password;
		}
		public void setPassword(String password) {
			this.password = password;
		}
	}
}

控制台输出Object{ result="[{"name":"root","passwo...FE62151AE967ECA5E0AA"}]",s="test"}