您好,我有 Java 类,它将从文件中读取和解析 JSON 数据并插入到数据库中,它们存储姓名、年龄和电话。该程序运行良好;但我的要求是,我有一个不同的 JSON 数据需要执行相同的操作,我想存储 AGE、ID 和 TYPE .我在上一部分提到了我的JSON数据
我从 https://javapages4all.wordpress.com/2012/12/10/read-from-json-file-and-persist-into-mysql/ 得到了这段代码
测试.json:
{'profiles':[
{'name':'Girish', 'age': 44, 'phone':'203-203-2030'},
{'name':'Alex','age':31, 'phone':'203-203-2030'},
{'name':'Amy', 'age': 24, 'phone':'203-203-2030'},
{'name':'Melissa','age':21, 'phone':'203-203-2030'}
]
}
Java 类:
package com.sample.json;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.Iterator;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import net.sf.json.JSONSerializer;
import org.apache.commons.io.IOUtils;
public class MyJson {
private static String tableName = "jsontest";
public static void main(String[] args) {
try {
ClassLoader cl = MyJson.class.getClassLoader();
InputStream is = cl.getResourceAsStream("test.json");
String str = IOUtils.toString(is);
JSONObject jsonObject = (JSONObject) JSONSerializer.toJSON(str);
System.out.println(jsonObject);
JSONArray jsonArr = jsonObject.getJSONArray("profiles");
JSONObject obj = null;
JSONArray nameArr = null;
JSONArray valArr = null;
for (int i = 0; i < jsonArr.size(); i++) {
obj = jsonArr.getJSONObject(i);
nameArr = obj.names();
valArr = obj.toJSONArray(nameArr);
//saveRecord(nameArr, valArr);
}
} catch (Exception e) {
e.printStackTrace();
}
}
private static void saveRecord(JSONArray nameArray, JSONArray valArray) {
Connection conn = getConnection();
StringBuffer sb = new StringBuffer("insert into " + tableName + "(");
int size = nameArray.size();
int count = 0;
Iterator<Object> iterator = nameArray.iterator();
while (iterator.hasNext()) {
if (count < (size - 1))
sb.append(iterator.next() + ",");
else
sb.append(iterator.next() + ")");
count++;
}
sb.append(" values(");
for (int i = 0; i < size; i++) {
if (i < (size - 1))
sb.append("?,");
else
sb.append("?)");
}
System.out.println(sb.toString());
try {
PreparedStatement pstmt = conn.prepareStatement(sb.toString());
bindVariables(valArray, pstmt);
pstmt.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
}
}
private static void bindVariables(JSONArray valArray,
PreparedStatement pstmt) throws SQLException {
Iterator<Object> iterator = valArray.iterator();
int cnt = 0;
while (iterator.hasNext()) {
Object obj = iterator.next();
if (obj instanceof String) {
pstmt.setString(++cnt, (String) obj);
} else if (obj instanceof Integer) {
pstmt.setLong(++cnt, (Integer) obj);
} else if (obj instanceof Long) {
pstmt.setLong(++cnt, (Long) obj);
} else if (obj instanceof Double) {
pstmt.setDouble(++cnt, (Double) obj);
}
}
}
private static Connection getConnection() {
Connection con = null;
String url = "jdbc:mysql://localhost:3306/";
String db = "jsondata";
String driver = "com.mysql.jdbc.Driver";
String user = "root";
String pass = "root";
try {
Class.forName(driver);
con = DriverManager.getConnection(url + db, user, pass);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
return con;
}
}
我的 JSON:
[{"emp":{"age":34,"ID":3423423},"type":"s"},
{"emp":{"age":43,"ID":324324235},"type":"s"},
{"emp":{"age":36,"ID":324324236},"type":"v"},
{"emp":{"age":46,"ID":324324238},"type":"s"},
{"emp":{"age":55,"ID":324324243},"type":"s"},
{"emp":{"age":44,"ID":324324287},"type":"s"}]
对于上面的程序,我想使用这个 JSON 数据
最佳答案
我使用 Gson
为您的案例做了一个简单的示例来解析 json
。
public class Result {
private long id;
private int age;
private String type;
public Result(long id, int age, String type) {
this.age = age;
this.id = id;
this.type = type;
}
}
public class EmployeeInfo {
private int age;
@SerializedName("ID")
private long id;
public EmployeeInfo(int age, long id) {
this.age = age;
this.id = id;
}
}
public class Employee {
@SerializedName("emp")
private EmployeeInfo employeeInfo;
private String type;
public Employee(EmployeeInfo employeeInfo, String type) {
this.employeeInfo = employeeInfo;
this.type = type;
}
}
运行:
public static void main(String[] args) throws IOException {
String json = "[{\"emp\":{\"age\":34,\"ID\":3423423},\"type\":\"s\"}, \n" +
"{\"emp\":{\"age\":43,\"ID\":324324235},\"type\":\"s\"}, \n" +
"{\"emp\":{\"age\":36,\"ID\":324324236},\"type\":\"v\"},\n" +
"{\"emp\":{\"age\":46,\"ID\":324324238},\"type\":\"s\"},\n" +
"{\"emp\":{\"age\":55,\"ID\":324324243},\"type\":\"s\"},\n" +
"{\"emp\":{\"age\":44,\"ID\":324324287},\"type\":\"s\"}]";
Gson gson = new Gson();
Type type = new TypeToken<List<Employee>>() {
}.getType();
List<Employee> employees = gson.fromJson(json, type);
List<Result> results = new ArrayList<>();
Result result;
for (Employee employee : employees) {
result = new Result(employee.getEmployeeInfo().getId(), employee.getEmployeeInfo().getAge(), employee.getType());
results.add(result);
}
System.out.println(gson.toJson(results));
}
关于java - 从文本文件解析 JSON 数据,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/31153936/