package test.zhizhi;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
/**
*
* @ClassName Item
* @author kanpiaoxue
* @version 1.0
* @CreateTime 2017/12/05 16:53:23
* @Description 数据填充项
*/
public class Item {
private Long id;
private String name;
private String code;
private Long category;
/**
*
* @author xuepeng
* @CreateTime 2017/12/05 16:53:23
*/
public Item() {
}
/*
* (non-Javadoc)
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
Item other = (Item) obj;
if (category == null) {
if (other.category != null) {
return false;
}
} else if (!category.equals(other.category)) {
return false;
}
if (code == null) {
if (other.code != null) {
return false;
}
} else if (!code.equals(other.code)) {
return false;
}
if (id == null) {
if (other.id != null) {
return false;
}
} else if (!id.equals(other.id)) {
return false;
}
if (name == null) {
if (other.name != null) {
return false;
}
} else if (!name.equals(other.name)) {
return false;
}
return true;
}
/**
* @return the category
*/
public Long getCategory() {
return category;
}
/**
* @return the code
*/
public String getCode() {
return code;
}
/**
* @return the id
*/
public Long getId() {
return id;
}
/**
* @return the name
*/
public String getName() {
return name;
}
/*
* (non-Javadoc)
* @see java.lang.Object#hashCode()
*/
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((category == null) ? 0 : category.hashCode());
result = prime * result + ((code == null) ? 0 : code.hashCode());
result = prime * result + ((id == null) ? 0 : id.hashCode());
result = prime * result + ((name == null) ? 0 : name.hashCode());
return result;
}
/**
* @param category the category to set
*/
public void setCategory(Long category) {
this.category = category;
}
/**
* @param code the code to set
*/
public void setCode(String code) {
this.code = code;
}
/**
* @param id the id to set
*/
public void setId(Long id) {
this.id = id;
}
/**
* @param name the name to set
*/
public void setName(String name) {
this.name = name;
}
/*
* (non-Javadoc)
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
// Gson gson = new GsonBuilder().setPrettyPrinting().create();
Gson gson = new GsonBuilder().create();
return gson.toJson(this);
}
}
package test.zhizhi;
/**
*
* @ClassName Result
* @author kanpiaoxue
* @version 1.0
* @CreateTime 2017/12/05 16:40:23
* @Description 结果包装类
*/
public class Result<T> {
private static final int SUCCESS_RESULT = 1;
private static final String SUCCESS_CODE = "SUCCESS";
private static final String SUCCESS_MESSAGE = "成功";
private Integer result;
private String code;
private String message;
private T data;
/**
*
* @author xuepeng
* @CreateTime 2017/12/05 16:40:23
*/
public Result() {
}
public static <T> Result<T> success(T data) {
Result<T> rs = new Result<T>();
rs.setResult(SUCCESS_RESULT);
rs.setCode(SUCCESS_CODE);
rs.setMessage(SUCCESS_MESSAGE);
rs.setData(data);
return rs;
}
/*
* (non-Javadoc)
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
Result<?> other = (Result<?>) obj;
if (code == null) {
if (other.code != null) {
return false;
}
} else if (!code.equals(other.code)) {
return false;
}
if (data == null) {
if (other.data != null) {
return false;
}
} else if (!data.equals(other.data)) {
return false;
}
if (message == null) {
if (other.message != null) {
return false;
}
} else if (!message.equals(other.message)) {
return false;
}
if (result == null) {
if (other.result != null) {
return false;
}
} else if (!result.equals(other.result)) {
return false;
}
return true;
}
/**
* @return the code
*/
public String getCode() {
return code;
}
/**
* @return the data
*/
public T getData() {
return data;
}
/**
* @return the message
*/
public String getMessage() {
return message;
}
/**
* @return the result
*/
public Integer getResult() {
return result;
}
/*
* (non-Javadoc)
* @see java.lang.Object#hashCode()
*/
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((code == null) ? 0 : code.hashCode());
result = prime * result + ((data == null) ? 0 : data.hashCode());
result = prime * result + ((message == null) ? 0 : message.hashCode());
result = prime * result + ((this.result == null) ? 0 : this.result.hashCode());
return result;
}
/**
*
* @return 是否成功
* @author xuepeng
* @CreateTime 2017/12/05 17:16:57
* @Description 判断当前的返回结果是否成功
*/
public boolean isSuccess() {
return SUCCESS_RESULT == this.result.intValue();
}
/**
* @param code the code to set
*/
public void setCode(String code) {
this.code = code;
}
/**
* @param data the data to set
*/
public void setData(T data) {
this.data = data;
}
/**
* @param message the message to set
*/
public void setMessage(String message) {
this.message = message;
}
/**
* @param result the result to set
*/
public void setResult(Integer result) {
this.result = result;
}
/*
* (non-Javadoc)
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return "Result [result=" + result + ", code=" + code + ", message=" + message + ", data=" + data
+ "]";
}
}
package test.zhizhi;
import com.google.common.collect.Lists;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.reflect.TypeToken;
import java.lang.reflect.Type;
import java.util.List;
/**
*
* @ClassName JSONExample
* @author kanpiaoxue
* @version 1.0
* @CreateTime 2017/12/05 16:36:27
* @Description JSON示例.
*
*
* pom.xml
* <dependency>
* <groupId>com.google.code.gson</groupId>
* <artifactId>gson</artifactId>
* <version>2.2.2</version>
* </dependency>
*
* <dependency>
* <groupId>com.google.guava</groupId>
* <artifactId>guava</artifactId>
* <version>23.0</version>
* </dependency>
*/
public class JSONExample {
/**
*
* @param args
* @author xuepeng
* @CreateTime 2017/12/05 16:36:27
* @Description
*/
public static void main(String[] args) {
JSONExample example = new JSONExample();
// 生成模拟数据，模拟HTTP request返回的json结构字符串
long size = 10L;
List<Item> items = example.createItems(size);
Result<List<Item>> result = example.createResult(items);
String json = example.toJSON(result);
System.out.println(String.format("get some json data from HTTP request:\n%s", json));
// 开始解析json结构字符串
// 1、判断返回的key 是否都存在。如果解析不抛出异常，那么就验证了该问题
Result<List<Item>> rs = example.fromJSON(json);
if (rs.isSuccess()) {
List<Item> datas = rs.getData();
// 2. data 中，数组的个数
System.out.println("data's size : " + datas.size());
for (Item item : datas) {
// 3、每个数组总的key and value
System.out.println(item);
}
} else {
System.err.println(
String.format("ERROR: some exception occured. error message is: %s", rs.getMessage()));
}
}
private List<Item> createItems(Long size) {
List<Item> items = Lists.newArrayList();
for (long i = 0; i < size; i++) {
Item item = new Item();
item.setId(i);
item.setName("name-" + i);
item.setCode("code-" + i);
item.setCategory(i + 2L);
items.add(item);
}
return items;
}
private Result<List<Item>> createResult(List<Item> items) {
Result<List<Item>> rs = Result.success(items);
return rs;
}
private Result<List<Item>> fromJSON(String json) {
Gson gson = new GsonBuilder().create();
Type type = new TypeToken<Result<List<Item>>>() {
}.getType();
Result<List<Item>> rs = gson.fromJson(json, type);
return rs;
}
private String toJSON(Object obj) {
// setPrettyPrinting() 的作用是格式化json结构，使其方便人眼来阅读。线上环境应该去掉，它会增加性能消耗
Gson gson = new GsonBuilder().setPrettyPrinting().create();
return gson.toJson(obj);
}
}