递归提取目录下的所有json格式的文件，重命名，并保存到另外的目录

所使用的jar: commons-io-2.4.jar,jackson-annotations-2.8.0-20160405.011944-16.jar,jackson-core-2.8.0-20160403.234143-59.jar,jackson-databind-2.8.0-20160407.052136-77.jar

代码Bean类：

import com.fasterxml.jackson.annotation.JsonProperty;/** *  * 这个Bean类对应了目录中的很多json文件，将json文件中共有的属性提取出来，形成了这个通用的Bean * json文件中含有特殊字符的名称，在java中无法定义为字符串的名称， * 通过JsonProperty方式，映射到对应的java字符串， * 如"@odata.id",无法声明java字符串为@odata.id，如何将json中的@odata.id赋给Bean类呢 * 能过JsonProperty方式解决这类问题 *  @JsonProperty("@odata.id") private String odataId; *//** * ObjectMapper类用序列化与反序列化映射器   * ObjectMapper mapper = new ObjectMapper();   *  * 当反序列化json时，未知属性会引起的反序列化被打断，这里我们禁用未知属性打断反序列化功能 * 因为，例如json里有10个属性，而我们的bean中只定义了2个属性，其它8个属性将被忽略  * mapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES); *//**@JsonIgnoreProperties(ignoreUnknown=true)也可以忽略多余的属性*/ public class CommonBean {    @JsonProperty("@odata.context") private String odataContext;    @JsonProperty("@odata.id") private String odataId;    @JsonProperty("@odata.type") private String odataType;    @JsonProperty("Id") private String id;    @JsonProperty("Name") private String name;    public CommonBean() {}public String getOdataContext() {return odataContext;}public void setOdataContext(String odataContext) {this.odataContext = odataContext;}public String getOdataId() {return odataId;}public void setOdataId(String odataId) {this.odataId = odataId;}public String getOdataType() {return odataType;}public void setOdataType(String odataType) {this.odataType = odataType;}public String getId() {return id;}public void setId(String id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}            }

代码递归目录下的文件，重命名，保存到另外的目录

import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.InputStream;import java.io.OutputStreamWriter;import java.util.ArrayList;import java.util.List;import org.apache.commons.io.IOUtils;import com.fasterxml.jackson.databind.DeserializationFeature;import com.fasterxml.jackson.databind.ObjectMapper;/* * 递归提取目录下的所有json格式的文件，重命名，并保存到另外的目录 *  */public class ExtractFilesFromFolder {private String saveFilePath = "json_data";private List<String> successfulFileList = new ArrayList<String>();private List<String> failedFileList = new ArrayList<String>();private List<String> allFileList = new ArrayList<String>();public ExtractFilesFromFolder(){}public ExtractFilesFromFolder(String saveFilePath){this.saveFilePath = saveFilePath;}public void FolderRecursion(String filePath){File root = new File(filePath);File[] files = root.listFiles();for( File file : files){if(file.isFile()){readAndSaveFile(file.getPath());}else{FolderRecursion(file.getPath());}}}public void readAndSaveFile(String filePath){try {allFileList.add(filePath);        InputStream inputStream = new FileInputStream(filePath);        /*借用第三方工具类，一下子读取文件的所有内容*/        String fileContent =  IOUtils.toString(inputStream);        inputStream.close();                        /*ObjectMapper类用序列化与反序列化映射器*/        ObjectMapper mapper = new ObjectMapper();        /*当反序列化json时，未知属性会引起的反序列化被打断，这里我们禁用未知属性打断反序列化功能，                   mapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES)            因为，例如json里有10个属性，而我们的bean中只定义了2个属性，其它8个属性将被忽略 */mapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);         File sourceFile = new File(filePath);        /*从json映射到java对象*/        CommonBean comBean = mapper.readValue(sourceFile, CommonBean.class);        String odataId = comBean.getOdataId();                String fileName = odataId.substring(1).replaceAll("/", "_")+".json";        String targetFilePath = saveFilePath+"\\"+fileName;        File targetFile = new File(targetFilePath);        if( targetFile.exists() ){        targetFilePath += "-2";        targetFile = new File(targetFilePath);        }        targetFile.createNewFile();                FileOutputStream fos = new FileOutputStream(targetFile);             /* 以UTF-8格式 保存文件  */                OutputStreamWriter osw = new OutputStreamWriter(fos, "UTF-8");                 osw.write(fileContent,0,fileContent.length());        osw.flush();        osw.close();        allFileList.add(targetFilePath);        successfulFileList.add(targetFilePath);}  catch (Exception e) {e.printStackTrace();failedFileList.add(filePath);} }public void setSaveFilePath(String saveFilePath) {this.saveFilePath = saveFilePath;}public String getSaveFilePath() {return saveFilePath;}public List<String> getSuccessfulFileList() {return successfulFileList;}public List<String> getFailedFileList() {return failedFileList;}public List<String> getAllFileList() {return allFileList;}}

测试类：

public class Test {/** * @param args */public static void main(String[] args) {String filePath = "development"; ExtractFilesFromFolder extractFiles = new ExtractFilesFromFolder();extractFiles.FolderRecursion(filePath);System.out.println("Successful files, number : "+extractFiles.getSuccessfulFileList().size()+","+extractFiles.getSuccessfulFileList());System.out.println("==============================================");System.out.println("Failed files, number :"+extractFiles.getFailedFileList().size()+","+extractFiles.getFailedFileList());System.out.println("==============================================");System.out.println("All files, number :"+extractFiles.getAllFileList().size()+","+extractFiles.getAllFileList());for(int i=0; i<extractFiles.getAllFileList().size();i++){System.out.println(extractFiles.getAllFileList().get(i));}}}

filePath = "development" 是工程根目录下的文件夹