怎么样将txt文档的json转成list

一、实现效果:

二、需要的jar

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.7.2</version>
</dependency>

三、思路

首先读取txt文件的json，然后在进行转成一个list，在输出的过程当中将输出list对象再次转成json，之后在转成对象，转两遍是为了输出的时候不会报错。

四、实现代码

public class RegionTest {
	
	private Integer id;
	
	private String province;
	
	private String city;
	
	private String area;

	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public String getProvince() {
		return province;
	}

	public void setProvince(String province) {
		this.province = province;
	}

	public String getCity() {
		return city;
	}

	public void setCity(String city) {
		this.city = city;
	}

	public String getArea() {
		return area;
	}
 
	public void setArea(String area) {
		this.area = area;
	}
	
	

}

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;

/**
* @author 
* @createDate 
* @Description:  
*/

public class TxtMain {
	
	private static ObjectMapper objectMapper = new ObjectMapper();
	
	public static void main(String[] args) {
		//读取json文件
		File file = new File("D:\\test.txt");
		String context = readFile(file);
		System.out.println(context);
		List<RegionTest> list = new ArrayList<RegionTest>();
		List<RegionTest> listTxt = (List<RegionTest>)json2java(context, list.getClass());
		for(int i = 0;i<listTxt.size();i++){
			String jsonObject= java2json(listTxt.get(i));
			RegionTest test = (RegionTest) json2java(jsonObject, RegionTest.class); 
			System.out.println(test.getProvince());
		}
		
	}
	
	
	  public static String readFile(File file) {
			StringBuilder result = new StringBuilder();
			FileReader fileReader = null;
			try {
			    fileReader = new FileReader(file);
			    BufferedReader br = new BufferedReader(fileReader);
			    String s = null;
			    while ((s = br.readLine()) != null) {
				result.append(s);
			    }
			    br.close();
			} catch (Exception e) {
			    e.printStackTrace();
			} finally {
			    try {
				if (fileReader != null) {
				    fileReader.close();
				    fileReader = null;
				}
			    } catch (IOException e) {
				e.printStackTrace();
			    }
			}
			return result.toString();
		    }
	
	
	  public static <T> T json2java(String json, Class<T> zlass) {
			if( json == null ){
				return null;
			}
			try {
				return objectMapper.readValue(json, zlass);
			} catch (JsonParseException e) {
				e.printStackTrace();
			} catch (JsonMappingException e) {
				e.printStackTrace();
			} catch (IOException e) {
				e.printStackTrace();
			}
			return null;
		}
	  
	  public static String java2json(Object obj) {
			try {

				return objectMapper.writeValueAsString(obj);
			} catch (JsonProcessingException e) {
				return "";
			}
		}

	
}