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  • Java读取CSV和XML文件方法

    游戏开发中,读取策划给的配置表是必不可少的,我在之前公司,策划给的是xml表来读取,现在公司策划给的是CSV表来读取,其实大同小异,也并不是什么难点,我就简单分享下Java如何读取XML文件和CSV文件。以下工具类可随意拿去使用。

    Java读XML文件

    如果是Maven项目,则依赖以下包(如果不是,则自己在项目添加配置相应jar包)

            <!-- dom4j begin -->
    		<dependency>
    			<groupId>dom4j</groupId>
    			<artifactId>dom4j</artifactId>
    			<version>1.6.1</version>
    		</dependency>
    		<!-- dom4j end -->
    		<!--xml转换 -->
    		<dependency>
    			<groupId>com.thoughtworks.xstream</groupId>
    			<artifactId>xstream</artifactId>
    			<version>1.4.3</version>
    		</dependency>
    

    读取XML文件应该是比较常见的,用dom4j就可以很简单的读出来,首先准备一个XML文件,来映射出所有的XML资源文件的名字,资源文件如下:

    dataConfig.xml
    <?xml version="1.0" encoding="UTF-8"?>
    <config>
     	<file name="Test.xml" />
    </config>
    

    示例资源XML文件如下

    Test.xml
    <?xml version="1.0" encoding="UTF-8"?>
    <dataset>
     	<Test attr1="" attr2="" attr3="" />
    </dataset>
    

    Java项目中建一个类,变量名与XML中属性名相同,Java代码通过这个XML文件来找出所有的资源XML文件,然后将XML文件中的属性值全部读取到类中,再把类放进Map,加载到内存中,这样,每次需要读取配置表,就可以直接从内存中读取,快速且方便
    以下是XmlDataLoader.java,作用是从数据表中读取属性值到内存

    package com.hjc._36.util.xml;
    
    import java.io.InputStream;
    import java.io.InputStreamReader;
    import java.io.UnsupportedEncodingException;
    import java.lang.reflect.Field;
    import java.lang.reflect.Modifier;
    import java.sql.Timestamp;
    import java.util.ArrayList;
    import java.util.Collections;
    import java.util.HashMap;
    import java.util.LinkedList;
    import java.util.List;
    import java.util.Map;
    
    import org.dom4j.Document;
    import org.dom4j.DocumentException;
    import org.dom4j.Element;
    import org.dom4j.io.SAXReader;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    
    import com.hjc._36.core.GameInit;
    import com.hjc._36.util.csv.TempletService;
    
    /**
     * 1 所有的template类都必须在一个包中 2 通过读取xml 遍历所有的Element,通过Element.name和 package 得到具体的
     * className; 3 通过Element的 attr 获取方法,并且根据parameterType 强制转换类型
     * 
     * @author Administrator
     * 
     */
    public class XmlDataLoader {
    	private String packageName;
    	private String config; // 每一行就是一个配置文件名字
    	private static Logger logger = LoggerFactory.getLogger(XmlDataLoader.class);
    	public static int ActivityMaxValue;
    
    	public XmlDataLoader(String packageName, String config) {
    		this.packageName = packageName;
    		this.config = config;
    	}
    
    	/**
    	 * 调用load方法加载所有的配置文件
    	 */
    	public void load() {
    		SAXReader reader = new SAXReader();
    		try {
    			Document doc = reader.read(new InputStreamReader(this.getClass()
    					.getResourceAsStream(this.config)));
    			List<?> nodes = doc.selectNodes("/config/file");
    			Map<String, List<?>> dataMap = new HashMap<String, List<?>>();
    			List<String> files = new LinkedList<String>();
    			for (Object n : nodes) {
    				Element t = (Element) n;
    				String f = t.attributeValue("name");
    				List<?> dataList = this.loadFile(f, true);
    				for (Object o : dataList) {
    					TempletService.getInstance().registerObject(o, dataMap);
    				}
    				files.add(f);
    			}
    			logger.info("读取配置完毕,准备afterLoad");
    			TempletService.templetMap = dataMap;
    			TempletService.getInstance().afterLoad();
    			logger.info("afterLoad 完毕");
    		} catch (DocumentException e) {
    			e.printStackTrace();
    		} finally {
    
    		}
    	}
    
    	private List<?> loadFile(String file, boolean exitWhenFail) {
    		try {
    			file = GameInit.confFileBasePath + file;
    			logger.info("load file: {}", file);
    			InputStream resourceAsStream = this.getClass().getResourceAsStream(
    					file);
    			if (resourceAsStream == null) {
    				logger.error("文件不存在:" + file);
    				if (exitWhenFail) {
    					System.exit(0);
    				}
    				return null;
    			}
    			return loadFromStream(resourceAsStream);
    		} catch (Exception e) {
    			logger.error("载入文件出错:" + file);
    			e.printStackTrace();
    			System.exit(0);
    		} finally {
    		}
    		return Collections.EMPTY_LIST;
    	}
    
    	public List<?> loadFromStream(InputStream resourceAsStream)
    			throws UnsupportedEncodingException, DocumentException,
    			InstantiationException, IllegalAccessException {
    		SAXReader reader = new SAXReader();
    		Document doc = reader.read(new InputStreamReader(resourceAsStream,
    				"utf-8"));
    		Element dataSet = (Element) doc.selectNodes("/dataset").get(0);
    		List<?> nodes = dataSet.elements();
    		// get clazz
    		String className = this.packageName
    				+ ((Element) nodes.get(0)).getName();
    		try {
    			Class<?> classObject = Class.forName(className);
    			if (classObject == null) {
    				logger.error("未找到类" + className);
    				return null;
    			}
    			// Get all the declared fields
    			Field[] fields = classObject.getDeclaredFields();
    			LinkedList<Field> fieldList = new LinkedList<Field>();
    			int length = fields.length;
    			for (int i = -1; ++i < length;) {
    				boolean isStaticField = Modifier.isStatic(fields[i]
    						.getModifiers());
    				if (isStaticField)
    					continue;
    				boolean isTransientField = Modifier.isTransient(fields[i]
    						.getModifiers());
    				if (isTransientField)
    					continue;
    				fieldList.add(fields[i]);
    			}
    			// Get all the declared fields of supper class
    			Class<?> tmp = classObject;
    			while ((tmp = tmp.getSuperclass()) != Object.class) {
    				System.out.print("the extends class is" + tmp.getName());
    				fields = tmp.getDeclaredFields();
    				length = fields.length;
    				if (length == 0)
    					continue;
    				for (int i = -1; ++i < length;) {
    					boolean isStaticField = Modifier.isStatic(fields[i]
    							.getModifiers());
    					if (isStaticField)
    						continue;
    					boolean isTransientField = Modifier.isTransient(fields[i]
    							.getModifiers());
    					if (isTransientField)
    						continue;
    					fieldList.add(fields[i]);
    				}
    			}
    			// The truly need to return object
    			List<Object> instances = new ArrayList<Object>(nodes.size());
    			Object instance = null;
    			String fieldName = null;
    			String fieldValue = null;
    			for (Object node : nodes) {
    				if (node != null) {
    					instance = classObject.newInstance();
    					boolean ok = false;
    					Element row = (Element) node;
    					for (Field field : fieldList) {
    						fieldName = field.getName();
    						fieldValue = row.attributeValue(fieldName);
    						if (fieldValue == null)
    							continue;
    						try {
    							this.setField(instance, field, fieldValue);
    							ok = true;
    						} catch (Exception e) {
    							logger.error("类名称是" + className + "的属性" + fieldName
    									+ "没有被成功赋予静态数据");
    							continue;
    						}
    					}
    					if (ok)
    						instances.add(instance);
    				}
    			}
    			return instances;
    		} catch (ClassNotFoundException e1) {
    			e1.printStackTrace();
    			logger.error("未找到类" + className);
    			return null;
    		}
    	}
    
    	public void reload() {
    	}
    
    	/**
    	 * 
    	 * @Title: setUnknowField
    	 * @Description:
    	 * @param ob
    	 * @param f
    	 * @param v
    	 * @throws IllegalArgumentException
    	 * @throws IllegalAccessException
    	 */
    	private void setField(Object obj, Field f, String v)
    			throws IllegalArgumentException, IllegalAccessException {
    		f.setAccessible(true);
    		if (f.getType() == int.class) {
    			f.setInt(obj, Integer.parseInt(v));
    		} else if (f.getType() == short.class) {
    			f.setShort(obj, Short.parseShort(v));
    		} else if (f.getType() == byte.class) {
    			f.setByte(obj, Byte.parseByte(v));
    		} else if (f.getType() == long.class) {
    			f.setLong(obj, Long.parseLong(v));
    		} else if (f.getType() == double.class) {
    			f.setDouble(obj, Double.parseDouble(v));
    		} else if (f.getType() == float.class) {
    			f.setFloat(obj, Float.parseFloat(v));
    		} else if (f.getType() == Timestamp.class) {
    			f.set(obj, Timestamp.valueOf(v));
    		} else {
    			f.set(obj, f.getType().cast(v));
    		}
    	}
    
    	/**
    	 * Test Code
    	 * 
    	 * @param args
    	 */
    	public static void main(String[] args) {
    		XmlDataLoader dl = new XmlDataLoader("com.hjc._36.template.",
    				"/dataConfig.xml");
    		dl.load();
    	}
    
    }
    

    如上的测试方法中看出,调用方式很简单,只需加载到映射XML文件,即可读取所有的配置XML文件,调用load()方法后,配置表就全部加载到了内存,我们通过以下类——TempletService.java来对这些配置数据进行管理:

    package com.hjc._36.util.csv;
    
    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    
    /**
     * 添加一个数据表需要做以下几步 
     * 1.在包com.hjc._36.template下创建对应的模板类,类名与数据文件一致 
     * 2.在src/main/resources/xml/中添加模板数据文件
     * 3.在src/main/resources/dataConfig.xml加入刚才的模板数据文件
     * 
     * @author 何金成
     * 
     */
    public class TempletService {
    	public static Logger log = LoggerFactory.getLogger(TempletService.class);
    	public static TempletService templetService = new TempletService();
    	/**
    	 * key:实体名 value:该实体下的所有模板数据
    	 */
    	public static Map<String, List<?>> templetMap = new HashMap<String, List<?>>();
    
    	public TempletService() {
    
    	}
    
    	public static TempletService getInstance() {
    		return templetService;
    	}
    
    	/**
    	 * 获取该实体类下所有模板数据
    	 * 
    	 * @param beanName
    	 * @return
    	 */
    	@SuppressWarnings("unchecked")
    	public static List listAll(String beanName) {
    		return templetMap.get(beanName);
    	}
    
    	/**
    	 * @Title: registerObject 
    	 * @Description: 注册对象到对应类的List中
    	 * @param o
    	 * @param dataMap
    	 * @return void
    	 * @throws
    	 */
    	public void registerObject(Object o, Map<String, List<?>> dataMap) {
    		add(o.getClass().getSimpleName(), o, dataMap);
    	}
    
    
    
    	@SuppressWarnings("unchecked")
    	private void add(String key, Object data, Map<String, List<?>> dataMap) {
    		List list = dataMap.get(key);
    		if (list == null) {
    			list = new ArrayList();
    			dataMap.put(key, list);
    		}
    		list.add(data);
    	}
    	
    	public void afterLoad() {
    		// 加载后处理
    		// List tests = TempletService.listAll(Test.class.getSimpleName());
    		// for (Object object : tests) {
    		// Test test = (Test)object;
    		// System.out.print(test.getEquipLv());
    		// System.out.print(","+test.getLv1());
    		// System.out.print(","+test.getLv2());
    		// System.out.print(","+test.getLv3());
    		// System.out.print(","+test.getLv4());
    		// System.out.print(","+test.getLv5());
    		// System.out.print(","+test.getLv6());
    		// System.out.print(","+test.getLv7());
    		// System.out.print(","+test.getLv8());
    		// System.out.print(","+test.getLv9());
    		// System.out.println(","+test.getLv10());
    		// }
    	}
    
    	public void loadCanShu() {
    		// 加载全局参数xml配置
    	}
    }
    

    在load()中,变用到了上述类的registerObject方法来添加数据,在使用时,只需要调用listAll方法即可,在上面代码中的测试代码已经写明了用法。

    Java读取CSV文件

    Java读CSV文件与读XML文件如出一辙,大致思路同上

    dataConfig.xml
    <?xml version="1.0" encoding="UTF-8"?>
    <config>
     	<file name="Test.csv" />
     	<file name="JunjichuUpgrade.csv" />
     	<file name="Card.csv" />
     	<file name="Equip.csv" />
     	<file name="Prop.csv" />
    </config>
    

    Test.csv如下:

    Test.csv
    等级,1星,2星,3星,4星,5星,6星,7星,8星,9星,10星,11星,12星,13星,14星,15星,16星,17星,18星,19星,20星,21星,22星,23星,24星,25星
    EquipLv,Lv1,Lv2,Lv3,Lv4,Lv5,Lv6,Lv7,Lv8,Lv9,Lv10,Lv11,Lv12,Lv13,Lv14,Lv15,Lv16,Lv17,Lv18,Lv19,Lv20,Lv21,Lv22,Lv23,Lv24,Lv25
    10,2,4,8,12,16,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
    20,6,12,24,36,48,60,72,84,96,108,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
    30,12,24,48,72,96,120,144,168,192,216,240,264,288,312,336,0,0,0,0,0,0,0,0,0,0
    40,20,40,80,120,160,200,240,280,320,360,400,440,480,520,560,0,0,0,0,0,0,0,0,0,0
    50,30,60,120,180,240,300,360,420,480,540,600,660,720,780,840,900,960,1020,1080,1140,0,0,0,0,0
    60,42,84,168,252,336,420,504,588,672,756,840,924,1008,1092,1176,1260,1344,1428,1512,1596,0,0,0,0,0
    70,56,112,224,336,448,560,672,784,896,1008,1120,1232,1344,1456,1568,1680,1792,1904,2016,2128,0,0,0,0,0
    80,72,144,288,432,576,720,864,1008,1152,1296,1440,1584,1728,1872,2016,2160,2304,2448,2592,2736,2880,3024,3168,3312,3456
    90,90,180,360,540,720,900,1080,1260,1440,1620,1800,1980,2160,2340,2520,2700,2880,3060,3240,3420,3600,3780,3960,4140,4320
    100,110,220,440,660,880,1100,1320,1540,1760,1980,2200,2420,2640,2860,3080,3300,3520,3740,3960,4180,4400,4620,4840,5060,5280
    

    如上CSV表大家也能看出来,CSV文件中的数据是以一定规律呈现的,解析CSV便是根据CSV文件的这些特性来进行解析的,解析工具类CsvParser.java代码如下:

    package com.hjc._36.util.csv;
    
    import java.io.BufferedReader;
    import java.io.BufferedWriter;
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.InputStreamReader;
    import java.io.OutputStreamWriter;
    import java.text.SimpleDateFormat;
    import java.util.ArrayList;
    import java.util.Date;
    import java.util.Iterator;
    import java.util.List;
    
    //JAVA 操作 excel 中的 .csv文件格式
    public class CsvParser {
    	private BufferedReader bufferedreader = null;
    	private List list = new ArrayList();
    
    	public CsvParser() {
    	}
    
    	public CsvParser(InputStream inStream) throws IOException {
    		InputStreamReader isr = new InputStreamReader(inStream, "UTF-8");
    		bufferedreader = new BufferedReader(isr);
    		String stemp;
    		while ((stemp = bufferedreader.readLine()) != null) {
    			list.add(stemp);
    		}
    	}
    
    	public List getList() throws IOException {
    		return list;
    	}
    	
    	public List getListWithNoHeader() throws IOException {
    		return list.subList(2, list.size());
    	}
    
    	// 得到csv文件的行数
    	public int getRowNum() {
    		return list.size();
    	}
    
    	// 得到csv文件的列数
    	public int getColNum() {
    		if (!list.toString().equals("[]")) {
    			if (list.get(0).toString().contains(",")) { // csv文件中,每列之间的是用','来分隔的
    				return list.get(0).toString().split(",").length;
    			} else if (list.get(0).toString().trim().length() != 0) {
    				return 1;
    			} else {
    				return 0;
    			}
    		} else {
    			return 0;
    		}
    	}
    
    	// 取得指定行的值
    	public String getRow(int index) {
    		if (this.list.size() != 0)
    			return (String) list.get(index);
    		else
    			return null;
    	}
    
    	// 取得指定列的值
    	public String getCol(int index) {
    		if (this.getColNum() == 0) {
    			return null;
    		}
    		StringBuffer scol = new StringBuffer();
    		String temp = null;
    		int colnum = this.getColNum();
    		if (colnum > 1) {
    			for (Iterator it = list.iterator(); it.hasNext();) {
    				temp = it.next().toString();
    				scol = scol.append(temp.split(",")[index] + ",");
    			}
    		} else {
    			for (Iterator it = list.iterator(); it.hasNext();) {
    				temp = it.next().toString();
    				scol = scol.append(temp + ",");
    			}
    		}
    		String str = new String(scol.toString());
    		str = str.substring(0, str.length() - 1);
    		return str;
    	}
    
    	// 取得指定行,指定列的值
    	public String getString(int row, int col) {
    		String temp = null;
    		int colnum = this.getColNum();
    		if (colnum > 1) {
    			temp = list.get(row).toString().split(",")[col];
    		} else if (colnum == 1) {
    			temp = list.get(row).toString();
    		} else {
    			temp = null;
    		}
    		return temp;
    	}
    
    	public void CsvClose() throws IOException {
    		this.bufferedreader.close();
    	}
    
    	public List readCvs(String filename) throws IOException {
    		CsvParser cu = new CsvParser(new FileInputStream(new File(filename)));
    		List list = cu.getList();
    
    		return list;
    	}
    
    	public void createCsv(String biao, List list, String path)
    			throws IOException {
    		List tt = list;
    		String data = "";
    		SimpleDateFormat dataFormat = new SimpleDateFormat("yyyyMMdd");
    		Date today = new Date();
    		String dateToday = dataFormat.format(today);
    		File file = new File(path + "resource/expert/" + dateToday
    				+ "importerrorinfo.csv");
    		if (!file.exists())
    			file.createNewFile();
    		else
    			file.delete();
    		String str[];
    		StringBuilder sb = new StringBuilder("");
    		sb.append(biao);
    		FileOutputStream writerStream = new FileOutputStream(file, true);
    		BufferedWriter output = new BufferedWriter(new OutputStreamWriter(
    				writerStream, "UTF-8"));
    		for (Iterator itt = tt.iterator(); itt.hasNext();) {
    			String fileStr = itt.next().toString();
    			// str = fileStr.split(",");
    			// for (int i = 0; i <= str.length - 1; i++) { // 拆分成数组 用于插入数据库中
    			// System.out.print("str[" + i + "]=" + str[i] + " ");
    			// }
    			// System.out.println("");
    			sb.append(fileStr + "\r\n");
    		}
    		output.write(sb.toString());
    		output.flush();
    		output.close();
    	}
    
    	public static void main(String[] args) throws IOException {
    		CsvParser test = new CsvParser();
    		List aaa = test.readCvs("D:/abc.csv");
    		for (int i = 0; i < aaa.size(); i++) {
    			System.out.println(i + "---" + aaa.get(i));
    			String a = (String) aaa.get(i).toString().split(",")[0];
    		}
    		System.out.println(aaa.size());
    		//String biao = "用户名,姓名,排序,专家类型,业务专长,错误信息\n";
    		//test.createCsv(biao, aaa, "D:/");
    		// test.run("D:/abc.csv");
    		// HttpServletResponse response = null;
    		// test.createCsv(response);
    //		CSVReader reader = new CSVReader(new FileReader("D:/abc.csv"));
    //		ColumnPositionMappingStrategy<Test> strat = new ColumnPositionMappingStrategy<Test>();
    //		strat.setType(Test.class);
    //		String[] columns = new String[] {"EquipLv","Lv1","Lv2","Lv3","Lv4","Lv5","Lv6","Lv7","Lv8","Lv9","Lv10","Lv11","Lv12","Lv13","Lv14","Lv15"}; // the fields to bind do in your JavaBean
    //		strat.setColumnMapping(columns);
    //		CsvToBean<Test> csv = new CsvToBean<Test>();
    //		List<Test> list = csv.parse(strat, reader);
    //		System.out.println(list.size());
    //		for (Test test : list) {
    //			System.out.println(test.getEquipLv());
    //			System.out.print(test.getLv1());
    //			System.out.print(test.getLv2());
    //			System.out.print(test.getLv3());
    //			System.out.print(test.getLv4());
    //			System.out.print(test.getLv5());
    //			System.out.print(test.getLv6());
    //			System.out.print(test.getLv7());
    //			System.out.print(test.getLv8());
    //			System.out.print(test.getLv9());
    //			System.out.print(test.getLv10());
    //			System.out.print(test.getLv11());
    //			System.out.print(test.getLv12());
    //			System.out.print(test.getLv13());
    //			System.out.print(test.getLv14());
    //			System.out.print(test.getLv15());
    //		}
    		
    	}
    }
    

    CSV解析与XML解析的区别仅限于此,XML使用SaxReader来进行解析,而CSV自定义解析方式(当然网上也有很多别得第三方解析工具),接下来的步骤与XML解析一模一样,CsvDataLoader.java稍有不同的地方就是解析CSV文件的部分,代码如下:

    package com.hjc._36.util.csv;
    
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.InputStreamReader;
    import java.lang.reflect.Field;
    import java.lang.reflect.Modifier;
    import java.sql.Timestamp;
    import java.util.ArrayList;
    import java.util.Collections;
    import java.util.HashMap;
    import java.util.LinkedList;
    import java.util.List;
    import java.util.Map;
    
    import org.dom4j.Document;
    import org.dom4j.DocumentException;
    import org.dom4j.Element;
    import org.dom4j.io.SAXReader;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    
    import com.hjc._36.core.GameInit;
    
    public class CsvDataLoader {
    	public static Logger logger = LoggerFactory.getLogger(CsvDataLoader.class);
    	private String packageName;
    	private String config; // 每一行就是一个配置文件名字
    	public static int ActivityMaxValue;
    
    	public CsvDataLoader(String packageName, String config) {
    		this.packageName = packageName;
    		this.config = config;
    	}
    
    	/**
    	 * 调用load方法加载所有的配置文件
    	 */
    	public void load() {
    		SAXReader reader = new SAXReader();
    		try {
    			Document doc = reader.read(new InputStreamReader(this.getClass()
    					.getResourceAsStream(this.config)));
    			List<?> nodes = doc.selectNodes("/config/file");
    			Map<String, List<?>> dataMap = new HashMap<String, List<?>>();
    			List<String> files = new LinkedList<String>();
    			for (Object n : nodes) {
    				Element t = (Element) n;
    				String f = t.attributeValue("name");
    				List<?> dataList = this.loadFile(f, true);
    				for (Object o : dataList) {
    					TempletService.getInstance().registerObject(o, dataMap);
    				}
    				files.add(f);
    			}
    			logger.info("读取配置完毕,准备afterLoad");
    			TempletService.templetMap = dataMap;
    			TempletService.getInstance().afterLoad();
    			logger.info("afterLoad 完毕");
    		} catch (DocumentException e) {
    			e.printStackTrace();
    		} finally {
    
    		}
    	}
    
    	private List<?> loadFile(String file, boolean exitWhenFail) {// 读文件
    		try {
    			String clzName = file.replaceAll(".csv", "");
    			file = GameInit.confFileBasePath + file;
    			logger.info("load file: {}", file);
    			InputStream resourceAsStream = this.getClass().getResourceAsStream(
    					file);
    			if (resourceAsStream == null) {
    				logger.error("文件不存在:" + file);
    				if (exitWhenFail) {
    					System.exit(0);
    				}
    				return null;
    			}
    			return loadFromStream(resourceAsStream, clzName);
    		} catch (Exception e) {
    			logger.error("载入文件出错:" + file);
    			e.printStackTrace();
    			System.exit(0);
    		} finally {
    		}
    		return Collections.EMPTY_LIST;
    	}
    
    	public List<?> loadFromStream(InputStream resourceAsStream, String clzName)
    			throws DocumentException, InstantiationException,
    			IllegalAccessException, IOException {// 读csv文件
    		CsvParser csvParser = new CsvParser(resourceAsStream);
    		List<String> nodes = csvParser.getListWithNoHeader();
    		// get clazz
    		String className = this.packageName + clzName;
    		try {
    			Class<?> classObject = Class.forName(className);
    			if (classObject == null) {
    				logger.error("未找到类" + className);
    				return null;
    			}
    			// Get all the declared fields
    			Field[] fields = classObject.getDeclaredFields();
    			LinkedList<Field> fieldList = new LinkedList<Field>();
    			int length = fields.length;
    			for (int i = -1; ++i < length;) {
    				boolean isStaticField = Modifier.isStatic(fields[i]
    						.getModifiers());
    				if (isStaticField)
    					continue;
    				boolean isTransientField = Modifier.isTransient(fields[i]
    						.getModifiers());
    				if (isTransientField)
    					continue;
    				fieldList.add(fields[i]);
    			}
    			// Get all the declared fields of supper class
    			Class<?> tmp = classObject;
    			while ((tmp = tmp.getSuperclass()) != Object.class) {
    				System.out.print("the extends class is" + tmp.getName());
    				fields = tmp.getDeclaredFields();
    				length = fields.length;
    				if (length == 0)
    					continue;
    				for (int i = -1; ++i < length;) {
    					boolean isStaticField = Modifier.isStatic(fields[i]
    							.getModifiers());
    					if (isStaticField)
    						continue;
    					boolean isTransientField = Modifier.isTransient(fields[i]
    							.getModifiers());
    					if (isTransientField)
    						continue;
    					fieldList.add(fields[i]);
    				}
    			}
    			// The truly need to return object
    			List<Object> instances = new ArrayList<Object>(nodes.size());
    			Object instance = null;
    			String fieldName = null;
    			String fieldValue = null;
    			for (String node : nodes) {
    				if (node != null) {
    					instance = classObject.newInstance();
    					boolean ok = false;
    					// Element row = (Element) node;
    					String[] values = node.split(",");// csv文件以英文逗号分割值
    					for (int i = 0; i < fieldList.size(); i++) {
    						Field field = fieldList.get(i);
    						fieldName = field.getName();
    						fieldValue = values[i];
    						if (fieldValue == null)
    							continue;
    						try {
    							this.setField(instance, field, fieldValue);
    							ok = true;
    						} catch (Exception e) {
    							logger.error("类名称是" + className + "的属性" + fieldName
    									+ "没有被成功赋予静态数据");
    							continue;
    						}
    					}
    					if (ok) {
    						instances.add(instance);
    					}
    				}
    			}
    			return instances;
    		} catch (ClassNotFoundException e1) {
    			e1.printStackTrace();
    			logger.error("未找到类" + className);
    			return null;
    		}
    	}
    
    	/**
    	 * 
    	 * @Title: setUnknowField
    	 * @Description:
    	 * @param ob
    	 * @param f
    	 * @param v
    	 * @throws IllegalArgumentException
    	 * @throws IllegalAccessException
    	 */
    	private void setField(Object obj, Field f, String v)
    			throws IllegalArgumentException, IllegalAccessException {
    		f.setAccessible(true);
    		if (f.getType() == int.class) {
    			f.setInt(obj, Integer.parseInt(v));
    		} else if (f.getType() == short.class) {
    			f.setShort(obj, Short.parseShort(v));
    		} else if (f.getType() == byte.class) {
    			f.setByte(obj, Byte.parseByte(v));
    		} else if (f.getType() == long.class) {
    			f.setLong(obj, Long.parseLong(v));
    		} else if (f.getType() == double.class) {
    			f.setDouble(obj, Double.parseDouble(v));
    		} else if (f.getType() == float.class) {
    			f.setFloat(obj, Float.parseFloat(v));
    		} else if (f.getType() == Timestamp.class) {
    			f.set(obj, Timestamp.valueOf(v));
    		} else {
    			f.set(obj, f.getType().cast(v));
    		}
    	}
    
    	/**
    	 * Test Code
    	 * 
    	 * @param args
    	 */
    	public static void main(String[] args) {
    		CsvDataLoader dl = new CsvDataLoader("com.hjc._36.template.",
    				"/dataConfig.xml");
    		dl.load();
    	}
    }
    

    最后load()加载过后,依然使用TempletService来进行管理,使用方法也相同,具体代码参照上面。

    以上便是我对Java读取CSV和XML资源文件的总结,有需要的同学可以直接拿去用。
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  • 原文地址:https://www.cnblogs.com/hjcenry/p/5856928.html
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