在Java Maven项目中，如何从JSON生成Java源文件?例如，我们有
{
"firstName": "John",
"lastName": "Smith",
"address": {
"streetAddress": "21 2nd Street",
"city": "New York"
}
}
当我们运行mvn generate-sources时，我们希望它生成这样的东西:
class Address {
JSONObject mInternalJSONObject;
Address (JSONObject json){
mInternalJSONObject = json;
}
String getStreetAddress () {
return mInternalJSONObject.getString("streetAddress");
}
String getCity (){
return mInternalJSONObject.getString("city");
}
}
class Person {
JSONObject mInternalJSONObject;
Person (JSONObject json){
mInternalJSONObject = json;
}
String getFirstName () {
return mInternalJSONObject.getString("firstName");
}
String getLastName (){
return mInternalJSONObject.getString("lastName");
}
Address getAddress (){
return Address(mInternalJSONObject.getString("address"));
}
}
作为Java开发人员，我需要在pom.xml中编写哪些XML行才能实现这一点?
试试http://www.jsonschema2pojo.org
或者Maven的jsonschema2pojo插件:
<plugin>
<groupId>org.jsonschema2pojo</groupId>
<artifactId>jsonschema2pojo-maven-plugin</artifactId>
<version>1.0.2</version>
<configuration>
<sourceDirectory>${basedir}/src/main/resources/schemas</sourceDirectory>
<targetPackage>com.myproject.jsonschemas</targetPackage>
<sourceType>json</sourceType>
</configuration>
<executions>
<execution>
<goals>
<goal>generate</goal>
</goals>
</execution>
</executions>
</plugin>
<sourceType>json</sourceType>涵盖了源是json的情况(如OP)。如果您有实际的json模式，请删除这一行。
2014年更新:自2009年12月提出这个问题以来，发生了两件事:
The JSON Schema spec has moved on a lot. It's still in draft (not finalised) but it's close to completion and is now a viable tool specifying your structural rules
I've recently started a new open source project specifically intended to solve your problem: jsonschema2pojo. The jsonschema2pojo tool takes a json schema document and generates DTO-style Java classes (in the form of .java source files). The project is not yet mature but already provides coverage of the most useful parts of json schema. I'm looking for more feedback from users to help drive the development. Right now you can use the tool from the command line or as a Maven plugin.
我知道这是一个老问题，但我是在自己试图寻找答案的时候偶然发现的。
答案中提到了在线json-pojo生成器(jsongen)，这很好，但我需要一些可以在命令行上运行并进行更多调整的东西。
因此，我编写了一个非常粗糙的ruby脚本来获取一个示例JSON文件并从中生成pojo。它有许多限制(例如，它不处理与java保留关键字匹配的字段)，但在许多情况下它已经足够了。
默认情况下，生成的代码对Jackson进行注释，但可以通过开关关闭。
你可以在github上找到代码:https://github.com/wotifgroup/json2pojo
谢谢所有想帮忙的人。对我来说，这个脚本很有帮助。它只处理普通JSON，不关心类型，而是自动执行一些例程
String str =
"{"
+ "'title': 'Computing and Information systems',"
+ "'id' : 1,"
+ "'children' : 'true',"
+ "'groups' : [{"
+ "'title' : 'Level one CIS',"
+ "'id' : 2,"
+ "'children' : 'true',"
+ "'groups' : [{"
+ "'title' : 'Intro To Computing and Internet',"
+ "'id' : 3,"
+ "'children': 'false',"
+ "'groups':[]"
+ "}]"
+ "}]"
+ "}";
JSONObject json = new JSONObject(str);
Iterator<String> iterator = json.keys();
System.out.println("Fields:");
while (iterator.hasNext() ){
System.out.println(String.format("public String %s;", iterator.next()));
}
System.out.println("public void Parse (String str){");
System.out.println("JSONObject json = new JSONObject(str);");
iterator = json.keys();
while (iterator.hasNext() ){
String key = iterator.next();
System.out.println(String.format("this.%s = json.getString(\"%s\");",key,key ));
System.out.println("}");
