我无法找到针对给定JSON模式String验证JSON字符串的最简单方法(供参考,这是在Java中,在Android应用程序中运行)。
理想情况下,我想传入JSON字符串和JSON模式字符串,并返回一个布尔值,告知它是否通过了验证。通过搜索,我找到了以下2个有希望的库来完成这个:
https://github.com/fge/json-schema-validator
然而,第一个看起来相当过时,支持不力。我将库实现到我的项目中,即使使用他们的JavaDocs,我也无法告诉如何正确构建“Validator”对象进行验证。
类似的故事与第二个,似乎是最新的良好的测试代码。然而,对于我想要做的事情,这很简单,对于如何专门完成我想要的事情(即使在查看ValidateServlet.java文件之后)似乎有点令人生畏和困惑。
好奇,如果有人有一个好的方法来完成这个(从它看起来),需要的简单任务,或者如果我可能需要坚持上面的第二个选项?提前谢谢!
答案 0 :(得分:13)
非常感谢Douglas Crockford和Francis Galiegue编写基于java的json架构处理器! http://json-schema-validator.herokuapp.com/index.jsp的在线测试人员非常棒!我真的很喜欢有用的错误消息(我只发现了一个失败的例子),虽然行和列和/或上下文会更好(现在,你只能在JSON格式错误期间获得行和列信息(由杰克逊提供)最后,我要感谢Michael Droettboom的伟大的教程(即使他只涉及Python,Ruby和C,同时显然忽略了所有语言中的最佳语言: - ))。
对于那些错过它的人(就像我最初做的那样),有一些例子可以在github.com/fge/json-schema-processor-examples找到。虽然这些示例非常令人印象深刻,但它们并不是最初请求的简单json验证示例(而且我也在寻找)。简单的例子在github.com/fge/json-schema-validator/blob/master/src/main/java/com/github/fge/jsonschema/examples/Example1.java
Alex的上述代码对我不起作用,但非常有帮助;我的pom正在推出最新的稳定版本2.0.1版,并在我的maven pom.xml文件中插入了以下依赖项:
<dependency>
<groupId>com.github.fge</groupId>
<artifactId>json-schema-validator</artifactId>
<version>2.0.1</version>
</dependency>
然后以下java代码对我来说很好:
import java.io.IOException;
import java.util.Iterator;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonNode;
import com.github.fge.jsonschema.exceptions.ProcessingException;
import com.github.fge.jsonschema.main.JsonSchema;
import com.github.fge.jsonschema.main.JsonSchemaFactory;
import com.github.fge.jsonschema.report.ProcessingMessage;
import com.github.fge.jsonschema.report.ProcessingReport;
import com.github.fge.jsonschema.util.JsonLoader;
public class JsonValidationExample
{
public boolean validate(String jsonData, String jsonSchema) {
ProcessingReport report = null;
boolean result = false;
try {
System.out.println("Applying schema: @<@<"+jsonSchema+">@>@ to data: #<#<"+jsonData+">#>#");
JsonNode schemaNode = JsonLoader.fromString(jsonSchema);
JsonNode data = JsonLoader.fromString(jsonData);
JsonSchemaFactory factory = JsonSchemaFactory.byDefault();
JsonSchema schema = factory.getJsonSchema(schemaNode);
report = schema.validate(data);
} catch (JsonParseException jpex) {
System.out.println("Error. Something went wrong trying to parse json data: #<#<"+jsonData+
">#># or json schema: @<@<"+jsonSchema+">@>@. Are the double quotes included? "+jpex.getMessage());
//jpex.printStackTrace();
} catch (ProcessingException pex) {
System.out.println("Error. Something went wrong trying to process json data: #<#<"+jsonData+
">#># with json schema: @<@<"+jsonSchema+">@>@ "+pex.getMessage());
//pex.printStackTrace();
} catch (IOException e) {
System.out.println("Error. Something went wrong trying to read json data: #<#<"+jsonData+
">#># or json schema: @<@<"+jsonSchema+">@>@");
//e.printStackTrace();
}
if (report != null) {
Iterator<ProcessingMessage> iter = report.iterator();
while (iter.hasNext()) {
ProcessingMessage pm = iter.next();
System.out.println("Processing Message: "+pm.getMessage());
}
result = report.isSuccess();
}
System.out.println(" Result=" +result);
return result;
}
public static void main(String[] args)
{
System.out.println( "Starting Json Validation." );
JsonValidationExample app = new JsonValidationExample();
String jsonData = "\"Redemption\"";
String jsonSchema = "{ \"type\": \"string\", \"minLength\": 2, \"maxLength\": 11}";
app.validate(jsonData, jsonSchema);
jsonData = "Agony"; // Quotes not included
app.validate(jsonData, jsonSchema);
jsonData = "42";
app.validate(jsonData, jsonSchema);
jsonData = "\"A\"";
app.validate(jsonData, jsonSchema);
jsonData = "\"The pity of Bilbo may rule the fate of many.\"";
app.validate(jsonData, jsonSchema);
}
}
上述代码的结果是:
Starting Json Validation.
Applying schema: @<@<{ "type": "string", "minLength": 2, "maxLength": 11}>@>@ to data: #<#<"Redemption">#>#
Result=true
Applying schema: @<@<{ "type": "string", "minLength": 2, "maxLength": 11}>@>@ to data: #<#<Agony>#>#
Error. Something went wrong trying to parse json data: #<#<Agony>#># or json schema: @<@<{ "type": "string", "minLength": 2, "maxLength": 11}>@>@. Are the double quotes included?
Result=false
Applying schema: @<@<{ "type": "string", "minLength": 2, "maxLength": 11}>@>@ to data: #<#<42>#>#
Processing Message: instance type does not match any allowed primitive type
Result=false
Applying schema: @<@<{ "type": "string", "minLength": 2, "maxLength": 11}>@>@ to data: #<#<"A">#>#
Processing Message: string is too short
Result=false
Applying schema: @<@<{ "type": "string", "minLength": 2, "maxLength": 11}>@>@ to data: #<#<"The pity of Bilbo may rule the fate of many.">#>#
Processing Message: string is too long
Result=false
享受!
答案 1 :(得分:10)
这基本上就是你链接的Servlet所做的事情,所以它可能不是单行,但它仍然具有表现力。
servlet上指定的 useV4
和useId
用于指定Default to draft v4
和Use id for addressing
的验证选项。
您可以在线查看:http://json-schema-validator.herokuapp.com/
public boolean validate(String jsonData, String jsonSchema, boolean useV4, boolean useId) throws Exception {
// create the Json nodes for schema and data
JsonNode schemaNode = JsonLoader.fromString(jsonSchema); // throws JsonProcessingException if error
JsonNode data = JsonLoader.fromString(jsonData); // same here
JsonSchemaFactory factory = JsonSchemaFactories.withOptions(useV4, useId);
// load the schema and validate
JsonSchema schema = factory.fromSchema(schemaNode);
ValidationReport report = schema.validate(data);
return report.isSuccess();
}
答案 2 :(得分:2)
@Alex的答案在Android上适用于我,但要求我使用Multi-dex并添加:
packagingOptions {
pickFirst 'META-INF/ASL-2.0.txt'
pickFirst 'draftv4/schema'
pickFirst 'draftv3/schema'
pickFirst 'META-INF/LICENSE'
pickFirst 'META-INF/LGPL-3.0.txt'
}
到我的build.gradle