[英]How to convert xml to .json file in java
public class ConvertXMLtoJSON {
public static void main(String[] args) throws Exception {
InputStream in = ConvertXMLtoJSON.class.getResourceAsStream("D:\\sample.xml");
String xml = IOUtils.toString(in);
XMLSerializer xmlSerializer = new XMLSerializer();
JSON json = xmlSerializer.read(xml);
System.out.println(json.toString(2));
}
}
但我收到錯誤
Exception in thread "main" java.lang.NullPointerException
at java.io.Reader.<init>(Reader.java:78)
at java.io.InputStreamReader.<init>(InputStreamReader.java:72)
at org.apache.commons.io.IOUtils.copy(IOUtils.java:1020)
at org.apache.commons.io.IOUtils.toString(IOUtils.java:358)
at com.apache.poi.ConvertXMLtoJSON.main(ConvertXMLtoJSON.java:13
你能幫我解決嗎 這是我的 xml 格式 ac3 AC3 Phone ACME phone 200.0 1.0 true
我已經從我的 excel 文件中生成了這個 xml,並且我已經將這個 xml 文件轉換為 json 文件
您正在嘗試將物理File
讀取為類路徑Resource
,這是錯誤的
InputStream in = ConvertXMLtoJSON.class.getResourceAsStream("D:\\sample.xml");
將其更改為
InputStream in = new FileInputStream(new File("D:\\sample.xml"));
String xml = IOUtils.toString(in);
這里 InputStream in
為 null 所以它引發NullPointerException
。
Class#getResourceAsStream(String name)
它用於從類路徑加載資源,通常用於基於 Web 的項目,使用以下算法從給定的資源名稱構造絕對資源名稱:
作為文檔
由於您的文件存在於本地硬盤驅動器( D:\\\\sample.xml
)中,最好使用FileInputStream
加載資源。
InputStream in = new FileInputStream("D:\\sample.xml");
找到一個很好的相關問題 -
這是用於將xml轉換為json的代碼
import org.json.JSONObject;
import org.json.JSONException;
import org.json.XML;
import java.io.*;
public class ConvertXMLtoJSON2{
public static void main(String[] args) throws Exception {
String fileName = "D:\\temp.json";
try {
File file = new File ("D:\\output333.xml");
InputStream inputStream = new FileInputStream(file);
StringBuilder builder = new StringBuilder();
int ptr = 0;
while ((ptr = inputStream.read()) != -1 ) {
builder.append((char) ptr);
// System.out.println(ptr);
}
String xml = builder.toString();
JSONObject jsonObj = XML.toJSONObject(xml);
// System.out.println(jsonObj.toString());
// System.out.println(jsonObj.toString().split(",").length);
// Assume default encoding.
FileWriter fileWriter =
new FileWriter(fileName);
// Always wrap FileWriter in BufferedWriter.
BufferedWriter bufferedWriter =
new BufferedWriter(fileWriter);
// Always close files.
for(int i= 0 ;i < jsonObj.toString().split(",").length; i ++) {
System.out.println(jsonObj.toString().split(",")[i]);
bufferedWriter.write(jsonObj.toString().split(",")[i]);
bufferedWriter.write("\n");
}
bufferedWriter.close();
}
/*
String xmlString = "<?xml version=\"1.0\"?><ASF_Service_ResponseVO id=\"1\"><service type=\"String\">OnboardingV2</service><operation type=\"String\">start_onboarding_session</operation><requested_version type=\"String\">1.0</requested_version><actual_version type=\"String\">1.0</actual_version><server_info type=\"String\">onboardingv2serv:start_onboarding_session&CalThreadId=85&TopLevelTxnStartTime=13b40fe91c4&Host=L-BLR-00438534&pid=3564</server_info><result type=\"Onboarding::StartOnboardingSessionResponse\" id=\"2\"><onboarding_id type=\"String\">137</onboarding_id><success type=\"bool\">true</success></result></ASF_Service_ResponseVO>";
JSONObject jsonObj = XML.toJSONObject(xmlString);
System.out.println(jsonObj.toString());
*/
catch(IOException ex) {
System.out.println(
"Error writing to file '"
+ fileName + "'");
// Or we could just do this:
// ex.printStackTrace();
} catch(Exception e) {
e.printStackTrace();
}
}
}
試試下面的代碼:
import org.json.JSONObject;
import org.json.XML;
import java.io.*;
public class ConverterXMLToJSON {
public static int PRETTY_FACTOR=4;
public static void main(String[] args) throws Exception {
String jsonFileName = "src\\main\\resources\\Light.json";
try {
File xmlFile = new File("src\\main\\resources\\Light.xml");
InputStream inputStream = new FileInputStream(xmlFile);
StringBuilder builder = new StringBuilder();
int ptr;
while ((ptr = inputStream.read()) != -1) {
builder.append((char) ptr);
}
String xml = builder.toString();
JSONObject jsonObj = XML.toJSONObject(xml);
System.out.print(jsonObj);
FileWriter fileWriter =
new FileWriter(jsonFileName);
// Always wrap FileWriter in BufferedWriter.
BufferedWriter bufferedWriter =
new BufferedWriter(fileWriter);
bufferedWriter.write(jsonObj.toString(PRETTY_FACTOR));
bufferedWriter.close();
} catch (IOException ex) {
System.out.println(
"Error writing to file '"
+ jsonFileName + "'");
} catch (Exception e) {
e.printStackTrace();
}
}
}
Underscore-java庫可以將 xml 轉換為 json。 活生生的例子
import com.github.underscore.lodash.U;
public class JsonConversion {
public static void main(String args[]) {
String xmlString = "<?xml version=\"1.0\"?><ASF_Service_ResponseVO id=\"1\"><service type=\"String\">OnboardingV2</service>"
+ "<operation type=\"String\">start_onboarding_session</operation><requested_version type=\"String\">1.0</requested_version>"
+ "<actual_version type=\"String\">1.0</actual_version><server_info type=\"String\">onboardingv2serv:start_onboarding_session"
+ "&CalThreadId=85&TopLevelTxnStartTime=13b40fe91c4&Host=L-BLR-00438534&pid=3564</server_info><result type="
+ "\"Onboarding::StartOnboardingSessionResponse\" id=\"2\"><onboarding_id type=\"String\">137</onboarding_id><success type="
+ "\"bool\">true</success></result></ASF_Service_ResponseVO>";
String json = U.xmlToJson(xmlString);
System.out.println(json);
}
}
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