JSONHelper 使用
进行接口测试的时候，难免会使用到JSON，下面介绍一下使用JSONHelper来回去JSON的值
JSONHelper介绍
JSONHelper借用了JSONPath和FASTJSON，可以方便的实现JSON返回和JAVA BEAN的转换以及获取JSON返回中的某些字段的值。
JSONHelper例子
一下例子是用来解释使用类xpath/cssselector的方式来获取JSON的值 如果假设返回的JSON如下例：
{
"store": {
"book": [
{
"category": "reference",
"author": "Nigel Rees",
"title": "Sayings of the Century",
"price": 8.95
},
{
"category": "fiction",
"author": "Evelyn Waugh",
"title": "Sword of Honour",
"price": 12.99
},
{
"category": "fiction",
"author": "Herman Melville",
"title": "Moby Dick",
"isbn": "0-553-21311-3",
"price": 8.99
},
{
"category": "fiction",
"author": "J. R. R. Tolkien",
"title": "The Lord of the Rings",
"isbn": "0-395-19395-8",
"price": 22.99
}
],
"bicycle": {
"color": "red",
"price": 19.95
}
},
"expensive": 10
}
使用以下是JSONPath的表示式,来获取不同的值
| JsonPath 表达式 | Result |
|---|---|
| $.store.book[*].author | The authors of all books |
| expensive | expensive's value |
| store | store's value |
| store.book | book in store |
| $..author | All authors |
| $.store.* | All things, both books and bicycles |
| $.store..price | The price of everything |
| $..book[2] | The third book |
| $..book[2].category | The third book's category value |
| $..book[(@.length-1)] | The last book |
| $..book[0,1] | The first two books |
| $..book[:2] | All books from index 0 (inclusive) until index 2 (exclusive) |
| $..book[1:2] | All books from index 1 (inclusive) until index 2 (exclusive) |
| $..book[-2:] | Last two books |
| $..book[2:] | Book number two from tail |
| $..book[?(@.isbn)] | All books with an ISBN number |
| $.store.book[?(@.price < 10)] | All books in store cheaper than 10 |
| $..book[?(@.price <= $['expensive'])] | All books in store that are not "expensive" |
| $..book[?(@.author =~ /.*REES/i)] | All books matching regex (ignore case) |
| $..* | everything |
JSON 值
private String jsonString = "{\n" +
" \"store\": {\n" +
" \"book\": [\n" +
" {\n" +
" \"category\": \"reference\",\n" +
" \"author\": \"Nigel Rees\",\n" +
" \"title\": \"Sayings of the Century\",\n" +
" \"price\": 8.95\n" +
" },\n" +
" {\n" +
" \"category\": \"fiction\",\n" +
" \"author\": \"Evelyn Waugh\",\n" +
" \"title\": \"Sword of Honour\",\n" +
" \"price\": 12.99\n" +
" },\n" +
" {\n" +
" \"category\": \"fiction\",\n" +
" \"author\": \"Herman Melville\",\n" +
" \"title\": \"Moby Dick\",\n" +
" \"isbn\": \"0-553-21311-3\",\n" +
" \"price\": 8.99\n" +
" },\n" +
" {\n" +
" \"category\": \"fiction\",\n" +
" \"author\": \"J. R. R. Tolkien\",\n" +
" \"title\": \"The Lord of the Rings\",\n" +
" \"isbn\": \"0-395-19395-8\",\n" +
" \"price\": 22.99\n" +
" }\n" +
" ],\n" +
" \"bicycle\": {\n" +
" \"color\": \"red\",\n" +
" \"price\": 19.95\n" +
" }\n" +
" },\n" +
" \"expensive\": 10\n" +
"}";
将Json转化为Java Bean
@Test
public void testToBean() throws Exception {
String test = JSONHelper.toBean("{'test':'abcd'}",String.class);
assertNotNull(test);
}
根据JsonPath获取相同字段值到一个List
@Test
public void testGetValue_ForList() throws Exception {
//getting JSONArray as List
List<String> value = (List<String>) JSONHelper.getValue(jsonString,".store.book[*].author");
System.out.println(value);
assertThat(value.size(), is(4));
}
根据JsonPath获取出一个List
@Test
public void testGetValue_ForListMap() throws Exception {
//getting JSONArray as List
List<Map> value = (List<Map>) JSONHelper.getValue(jsonString,".store.book[*]");
System.out.println(value);
assertThat(value.size(), is(4));
}
@Test
public void testGetValue_ForValueMap() throws Exception {
//getting JSONArray as List
List<Map> value = (List<Map>) JSONHelper.getValue(jsonString,".store.*");
System.out.println(value);
assertThat(value.size(), is(2));
}
@Test
public void testGetValue_ForValueFromRoot() throws Exception {
//getting JSONArray as List
List<Map<String,String>> value = (List<Map<String,String>>) JSONHelper.getValue(jsonString,"$.*");
System.out.println(value);
assertThat(value.size(), is(2));
}
@Test
public void testGetValue_GetByIndex(){
Map<String,String> value = JSONHelper.getValueToMap(jsonString,"$..book[2]");
System.out.println(value);
assertThat(value.size(),greaterThan(0));
}
@Test
public void testGetValue_GetListByIndex(){
List<Map<String,String>> value = (List<Map<String, String>>) JSONHelper.getValue(jsonString,"$..book[2]");
System.out.println(value);
assertThat(value.size(),greaterThan(0));
}
@Test
public void testGetValue_GetByIndexSlice(){
HashMap value = (HashMap) JSONHelper.getValue(jsonString,"$.store.book[1:2]");
System.out.println(value);
assertThat(value.size(),greaterThan(0));
}
根据JsonPath获取出一个值
@Test
public void testGetValue_GetByPath(){
String value = (String) JSONHelper.getValue(jsonString,"$.store.book[2].title");
System.out.println(value);
assertThat(value.length(),greaterThan(0));
}
以下是根据不同JsonPath获取不同值的方法
@Test
public void testGetValue_GetBySlice(){
HashMap value = (HashMap) JSONHelper.getValue(jsonString,"$.store.book[-1:]");
System.out.println(value);
assertThat(value.size(),greaterThan(0));
}
@Test
public void testGetValue_GetBySliceIndex(){
List<Map> value = (List<Map>) JSONHelper.getValue(jsonString,"$.store.book[-2:]");
System.out.println(value);
assertThat(value.size(),greaterThan(0));
}
@Test
public void testGetValue_GetByAttribute(){
List<Map> value = (List<Map>) JSONHelper.getValue(jsonString,"$.store.book[?(@.price < 10)]");
System.out.println(value);
assertThat(value.size(),greaterThan(0));
}
@Test
public void testGetValue_GetByExpress(){
List<Map> value = (List<Map>) JSONHelper.getValue(jsonString,"$..book[?(@.price <= $['expensive'])]");
System.out.println(value);
assertThat(value.size(),greaterThan(0));
}
@Test
public void testGetValue_GetAll(){
List<Map> value = (List<Map>) JSONHelper.getValue(jsonString,"$..*");
System.out.println(value);
assertThat(value.size(),greaterThan(0));
}
常用处理JSON的第三方包
- fastjson
- jackson
- jsonpath
- gson