我遇到了一个"复杂的问题"杰森:
{
"Books": [
{
"title": "Java",
"instructions": [],
"links": {
"EJB": {
"href": "www.java.com/EJB"
}
}
},
{
"title": "C#",
"instructions": [],
"links": {
"SOAP": {
"href": "www.C#.com/SOAP"
}
}
}]
}
有人可以告诉我如何反序列化这种JSON以获得POJO列表吗?
POJO必须是" Book"有3个字段:标题,说明和链接
谢谢。答案 0 :(得分:1)
您的初学者JSON存在根本问题;你有重复的成员名称。
在这种情况下,解析器的行为是未定义(RFC 7159, section 4)。由于jsonschema2pojo使用Jackson,这意味着您将获得每个重复成员的 last 定义值。
使用数组:
[
{
"title":"Title 1",
"instructions" : [],
"links": {
"link 1": {
"href": "The link 1"
}
}
},
{
"title":"Title 2",
"instructions" : [],
"links": {
"link 2": {
"href": "The link 2"
}
}
}
]
然后,jsonschema2pojo不会真正反序列化为POJO;你真正想要的是为数组元素(即一个对象)定义类MyClass
并使用Jackson的ObjectMapper来反序列化:
final TypeReference<List<MyClass>> typeref
= new TypeReference<List<MyClass>>() {};
final ObjectMapper mapper = new ObjectMapper();
final List<MyClass> list = mapper.readValue(whatever, typeref);
答案 1 :(得分:0)
您的POJO
课程可能如下所示:
class Books {
@JsonProperty("Books")
private List<Book> books;
public List<Book> getBooks() {
return books;
}
public void setBooks(List<Book> books) {
this.books = books;
}
@Override
public String toString() {
return "Books [books=" + books + "]";
}
}
class Book {
private String title;
private List<String> instructions;
private Map<String, Link> links;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public List<String> getInstructions() {
return instructions;
}
public void setInstructions(List<String> instructions) {
this.instructions = instructions;
}
public Map<String, Link> getLinks() {
return links;
}
public void setLinks(Map<String, Link> links) {
this.links = links;
}
@Override
public String toString() {
return "Book [title=" + title + ", instructions=" + instructions + ", links=" + links + "]";
}
}
class Link {
private String href;
public String getHref() {
return href;
}
public void setHref(String href) {
this.href = href;
}
@Override
public String toString() {
return href;
}
}
简单用法:
ObjectMapper mapper = new ObjectMapper();
System.out.println(mapper.readValue(json, Books.class));
以上程序打印:
Books [books=[Book [title=Java, instructions=[], links={EJB=www.java.com/EJB}], Book [title=C#, instructions=[], links={SOAP=www.C#.com/SOAP}]]]