ObjectMapper比较两个Java对象、json对象,反序列化时将空字符串转为null
package com.wyy.sourceCode;import com.fasterxml.jackson.databind.JsonNode;import com.fasterxml.jackson.databind.ObjectMapper;import com.fasterxml.jackson.databind.node.NullNode;import com.fasterxml.ja
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package com.wyy.sourceCode;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.NullNode;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.fasterxml.jackson.databind.node.TextNode;
import java.io.IOException;
import java.util.Iterator;
import java.util.Map;
public class Om1 {
public static void main(String[] args) throws IOException {
ObjectMapper objectMapper = new ObjectMapper();
/*
{"s1":"k1", "s2":"", "s3":null, "s4":{"p1":"k1", "p2":"", "p3":["d1","d2"]}}
{"s1":"k1","s2":"null","s3":null,"s4":{"p1":"k1","p2":"null","p3":["d1","d2"]}}
*/
String w1 = "{\"s1\":\"k1\", \"s2\":\"\", \"s3\":null, \"s4\":{\"p1\":\"k1\", \"p2\":\"\", \"p3\":[\"d1\",\"d2\"]}}";
// String w3 = "{\n" +
// " \"s1\": \"k1\",\n" +
// " \"s2\": \"null\",\n" +
// " \"s3\": null,\n" +
// " \"s4\": {\n" +
// " \"p1\": \"k1\",\n" +
// " \"p2\": \"null\",\n" +
// " \"p3\": [\n" +
// " \"d1\",\n" +
// " \"d2\"\n" +
// " ]\n" +
// " },\n" +
// " \"s5\": [\n" +
// " {\n" +
// " \"l1\": \"pp\",\n" +
// " \"l2\": null,\n" +
// " \"l3\": \"\",\n" +
// " \"l4\": {\"k1\": null, \"k2\": \"\", \"k3\": [1,2,3]}\n" +
// " }\n" +
// " ]\n" +
// "}";
// objectMapper.registerModule();
JsonNode jsonNode = objectMapper.readTree(w1);
jsonLeaf(jsonNode);
System.out.println(jsonNode);
String w2 = "{\"s1\":\"k1\", \"s2\":\"\", \"s3\":null, \"s4\":{\"p3\":[\"d1\",\"d2\"], \"p1\":\"k1\", \"p2\":\"\"}}";
JsonNode jsonNode2 = objectMapper.readTree(w2);
jsonLeaf(jsonNode2);
System.out.println(jsonNode2);
System.out.println(jsonNode.equals(jsonNode2));
}
public static void jsonLeaf(JsonNode node) {
if (node.isObject()) {
Iterator<Map.Entry<String, JsonNode>> it = node.fields();
while (it.hasNext()) {
Map.Entry<String, JsonNode> entry = it.next();
if ("".equals(entry.getValue().textValue())) {
entry.setValue(NullNode.getInstance());
continue;
}
jsonLeaf(entry.getValue());
}
}
if (node.isArray()) {
Iterator<JsonNode> it = node.iterator();
while (it.hasNext()) {
jsonLeaf(it.next());
}
}
}
}
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