java 如何在pdf中生成表格详解编程语言

package com.zcr.until; 
 
public class User  
{ 
    private String name; 
    private int age ; 
    private float height; 
    private String adress; 
    private String sex; 
    private String jj; 
     
    public String getJj() 
    { 
        return jj; 
    } 
 
    public void setJj(String jj) 
    { 
        this.jj = jj; 
    } 
 
    public User() 
    { 
     
    } 
 
    public User(String name,int age,float height,String adress,String sex,String jj) 
    { 
        this.name = name; 
        this.age = age; 
        this.height = height; 
        this.adress = adress; 
        this.sex = sex; 
        this.jj = jj; 
    } 
     
    public String getAdress() 
    { 
        return adress; 
    } 
 
    public void setAdress(String adress) 
    { 
        this.adress = adress; 
    } 
 
    public String getSex() 
    { 
        return sex; 
    } 
 
    public void setSex(String sex) 
    { 
        this.sex = sex; 
    } 
 
     
     
    public String getName() { 
        return name; 
    } 
    public void setName(String name) { 
        this.name = name; 
    } 
    public int getAge() { 
        return age; 
    } 
    public void setAge(int age) { 
        this.age = age; 
    } 
    public float getHeight() { 
        return height; 
    } 
    public void setHeight(float height) { 
        this.height = height; 
    } 
     
}

pdfPath=E/:/appDataPdf

package com.zcr.until; 
 
import java.io.BufferedInputStream; 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.IOException; 
import java.io.InputStream; 
import java.util.Properties; 
 
public class GetFilePlace  
{ 
    /** 
     * 读取文件，获取excel保存的根目录 
     * @return  excel保存的根目录 
     */ 
    public   String getFilePath() 
    { 
        String dir = System.getProperty("user.dir");  //获得tomcat所在的工作路径   
         
        //获取到存储了文件存储位置的filedir.properties 文件路径   --->java Project的文件路径 
        String realDir = dir + File.separator + "src" + File.separator +"META-INF" + File.separator + "filedir.properties"; 
        
　　　　 //Web project存储路径 
        /*String realDir = dir.substring(0, dir.length()-4) + File.separator +"webapps" + File.separator + "generateExcels"  
                      + File.separator + "classes" + File.separator + "META-INF" + File.separator + "config" + File.separator + "filedir.properties"; 
    */ 
        return realDir; 
    } 
     
    /** 
     * 获取filePath路径【properities文件】中key对应的值， 
     * @param filePath properities文件路径【包含properities文件】 
     * @param key 要查找的key值 
     * @return key对应的value 
     */ 
     public   String GetValueByKey(String filePath, String key)  
     { 
         Properties pps = new Properties(); 
         try { 
              InputStream in = new BufferedInputStream (new FileInputStream(filePath));   
              pps.load(in); 
             String value = pps.getProperty(key); 
             in.close(); 
             return value; 
              
         }catch (IOException e) { 
             e.printStackTrace(); 
             return null; 
         } 
     } 
     
    /** 
     * 查询properities文件中可以对应的存储地点 
     * @param key 查询主键 
     * @return    key对应的存储地址 
     */ 
    public  String getFileDirFromProperties(String key) 
    { 
        return GetValueByKey(getFilePath(),key); 
    } 
 
}

package com.zcr.service; 
 
import java.io.File; 
import java.text.SimpleDateFormat; 
import java.util.Calendar; 
 
public class GenerateFold 
{ 
    /** 
     * 查询当前生成的excel需要存在在哪个路径，如果存在则存储在相应的位置，否则生成改目录， 每天生成一个文件夹，文件夹的命名规则为 年月日的时间戳 
     * @param foldName  生成excel保存路径 
     * @return            现在的excel需要保存路径 
     */ 
    public  String getFold(String foldName) 
    { 
        SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd"); 
         
        String todayStr = format.format(Calendar.getInstance().getTime()); 
         
        String foldPath = foldName + File.separator + todayStr;  
         
        File file = new File(foldPath); 
         
        if(!file.exists() && !file.isDirectory()) 
        { 
            System.out.println("不存在"); 
            file.mkdirs(); 
        } 
        else 
        { 
            System.out.println("存在"); 
        } 
        return  foldPath; 
    } 
 
}

package com.zcr.until; 
 
import java.io.File; 
import java.text.SimpleDateFormat; 
import java.util.Calendar; 
import java.util.UUID; 
 
/** 
 * 生成文件名字 
 * @author zcr 
 * 
 */ 
public class GenerateFileName 
{ 
    /** 
     * 根据文件类别生成文件的名字,文件的命名规则是:文件目录/生成时间-uuid（全球唯一编码）.文件类别 
     * @param fileDir  文件的存储路径 
     * @param fileType 文件的类别 
     * @return                 文件的名字   
     */ 
    public String generateFileName(String fileDir,String fileType) 
    { 
        String saveFileName = ""; 
        SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmssSS"); 
        saveFileName += format.format(Calendar.getInstance().getTime()); 
         
        UUID uuid = UUID.randomUUID();  //全球唯一编码 
         
        saveFileName += "-" + uuid.toString(); 
        saveFileName += "." + fileType; 
         
        saveFileName = fileDir + File.separator + saveFileName; 
         
        return saveFileName; 
    } 
}

package com.zcr.service; 
 
import java.io.File; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.lang.reflect.InvocationTargetException; 
import java.lang.reflect.Method; 
import java.util.ArrayList; 
import java.util.List; 
 
import com.lowagie.text.Document; 
import com.lowagie.text.DocumentException; 
import com.lowagie.text.Element; 
import com.lowagie.text.Font; 
import com.lowagie.text.PageSize; 
import com.lowagie.text.Phrase; 
import com.lowagie.text.pdf.BaseFont; 
import com.lowagie.text.pdf.PdfPCell; 
import com.lowagie.text.pdf.PdfPTable; 
import com.lowagie.text.pdf.PdfWriter; 
import com.zcr.until.GenerateFileName; 
import com.zcr.until.GetFilePlace; 
import com.zcr.until.User; 
 
/** 
 * 生成pdf 
 * @author zcr 
 *  
 */ 
public class CreatePdf 
{ 
    Document document = new Document();// 建立一个Document对象 
 
    private static Font headfont;// 设置字体大小 
    private static Font keyfont;// 设置字体大小 
    private static Font textfont;// 设置字体大小 
 
    static 
    { 
        //中文格式 
        BaseFont bfChinese; 
        try 
        { 
            // 设置中文显示 
            bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H",BaseFont.NOT_EMBEDDED); 
            headfont = new Font(bfChinese, 10, Font.BOLD);// 设置字体大小 
            keyfont = new Font(bfChinese, 8, Font.BOLD);// 设置字体大小 
            textfont = new Font(bfChinese, 8, Font.NORMAL);// 设置字体大小 
        } 
        catch (Exception e) 
        { 
            e.printStackTrace(); 
        } 
    } 
     
    /** 
     * 文成文件 
     * @param file 待生成的文件名 
     */ 
    public CreatePdf(File file) 
    { 
        document.setPageSize(PageSize.A4);// 设置页面大小 
        try 
        { 
            PdfWriter.getInstance(document, new FileOutputStream(file)); 
            document.open(); 
        } 
        catch (Exception e) 
        { 
            e.printStackTrace(); 
        } 
    } 
     
    public CreatePdf() 
    { 
         
    } 
     
    public void initFile(File file) 
    { 
        document.setPageSize(PageSize.A4);// 设置页面大小 
        try 
        { 
            PdfWriter.getInstance(document, new FileOutputStream(file)); 
            document.open(); 
        } 
        catch (Exception e) 
        { 
            e.printStackTrace(); 
        } 
    } 
     
 
    int maxWidth = 520; 
     
    /** 
     * 为表格添加一个内容 
     * @param value           值 
     * @param font            字体 
     * @param align            对齐方式 
     * @return                添加的文本框 
     */ 
    public PdfPCell createCell(String value, Font font, int align) 
    { 
        PdfPCell cell = new PdfPCell(); 
        cell.setVerticalAlignment(Element.ALIGN_MIDDLE); 
        cell.setHorizontalAlignment(align); 
        cell.setPhrase(new Phrase(value, font)); 
        return cell; 
    } 
     
    /** 
     * 为表格添加一个内容 
     * @param value           值 
     * @param font            字体 
     * @return                添加的文本框 
     */ 
    public PdfPCell createCell(String value, Font font) 
    { 
        PdfPCell cell = new PdfPCell(); 
        cell.setVerticalAlignment(Element.ALIGN_MIDDLE); 
        cell.setHorizontalAlignment(Element.ALIGN_CENTER); 
        cell.setPhrase(new Phrase(value, font)); 
        return cell; 
    } 
 
    /** 
     * 为表格添加一个内容 
     * @param value           值 
     * @param font            字体 
     * @param align            对齐方式 
     * @param colspan        占多少列 
     * @return                添加的文本框 
     */ 
    public PdfPCell createCell(String value, Font font, int align, int colspan) 
    { 
        PdfPCell cell = new PdfPCell(); 
        cell.setVerticalAlignment(Element.ALIGN_MIDDLE); 
        cell.setHorizontalAlignment(align); 
        cell.setColspan(colspan); 
        cell.setPhrase(new Phrase(value, font)); 
        return cell; 
    } 
     
    /** 
     * 为表格添加一个内容 
     * @param value           值 
     * @param font            字体 
     * @param align            对齐方式 
     * @param colspan        占多少列 
     * @param boderFlag        是否有有边框 
     * @return                添加的文本框 
     */ 
    public PdfPCell createCell(String value, Font font, int align, int colspan, 
            boolean boderFlag) 
    { 
        PdfPCell cell = new PdfPCell(); 
        cell.setVerticalAlignment(Element.ALIGN_MIDDLE); 
        cell.setHorizontalAlignment(align); 
        cell.setColspan(colspan); 
        cell.setPhrase(new Phrase(value, font)); 
        cell.setPadding(3.0f); 
        if (!boderFlag) 
        { 
            cell.setBorder(0); 
            cell.setPaddingTop(15.0f); 
            cell.setPaddingBottom(8.0f); 
        } 
        return cell; 
    } 
 
    /** 
     * 创建一个表格对象 
     * @param colNumber  表格的列数 
     * @return              生成的表格对象 
     */ 
    public PdfPTable createTable(int colNumber) 
    { 
        PdfPTable table = new PdfPTable(colNumber); 
        try 
        { 
            table.setTotalWidth(maxWidth); 
            table.setLockedWidth(true); 
            table.setHorizontalAlignment(Element.ALIGN_CENTER); 
            table.getDefaultCell().setBorder(1); 
        } 
        catch (Exception e) 
        { 
            e.printStackTrace(); 
        } 
        return table; 
    } 
 
    public PdfPTable createTable(float[] widths) 
    { 
        PdfPTable table = new PdfPTable(widths); 
        try 
        { 
            table.setTotalWidth(maxWidth); 
            table.setLockedWidth(true); 
            table.setHorizontalAlignment(Element.ALIGN_CENTER); 
            table.getDefaultCell().setBorder(1); 
        } 
        catch (Exception e) 
        { 
            e.printStackTrace(); 
        } 
        return table; 
    } 
 
    public PdfPTable createBlankTable() 
    { 
        PdfPTable table = new PdfPTable(1); 
        table.getDefaultCell().setBorder(0); 
        table.addCell(createCell("", keyfont)); 
        table.setSpacingAfter(20.0f); 
        table.setSpacingBefore(20.0f); 
        return table; 
    } 
 
    public <T> void generatePDF(String [] head,List<T> list,int colNum)  
    { 
        Class classType = list.get(0).getClass(); 
         
        // 创建一个只有5列的表格 
        PdfPTable table = createTable(colNum); 
 
        // 添加备注,靠左，不显示边框 
        table.addCell(createCell("APP信息列表：", keyfont, Element.ALIGN_LEFT, colNum,false)); 
         
        //设置表头 
        for(int i = 0 ; i < colNum ; i++) 
        { 
            table.addCell(createCell(head[i], keyfont, Element.ALIGN_CENTER)); 
        } 
         
         
        if(null != list && list.size() > 0) 
        { 
            int size = list.size(); 
            for(int i = 0 ; i < size ; i++) 
            { 
                T t = list.get(i); 
                for(int j = 0 ; j < colNum ; j ++) 
                { 
                    //获得首字母 
                    String firstLetter = head[j].substring(0,1).toUpperCase();  
                     
                    //获得get方法,getName,getAge等 
                    String getMethodName = "get" + firstLetter + head[j].substring(1); 
                    
                    Method method; 
                    try 
                    { 
                        //通过反射获得相应的get方法，用于获得相应的属性值 
                        method = classType.getMethod(getMethodName, new Class[]{}); 
                        try 
                        { 
                             System.out.print(getMethodName +":" + method.invoke(t, new Class[]{}) +","); 
                             //添加数据 
                             table.addCell(createCell(method.invoke(t, new Class[]{}).toString(), textfont)); 
                        } 
                        catch (IllegalArgumentException e) 
                        { 
                            e.printStackTrace(); 
                        } 
                        catch (IllegalAccessException e) 
                        { 
                            e.printStackTrace(); 
                        } 
                        catch (InvocationTargetException e) 
                        { 
                            e.printStackTrace(); 
                        }   
                    } 
                    catch (SecurityException e) 
                    { 
                        e.printStackTrace(); 
                    } 
                    catch (NoSuchMethodException e) 
                    { 
                        e.printStackTrace(); 
                    } 
                } 
                 
                System.out.println(""); 
            } 
        } 
         
        try 
        { 
            //将表格添加到文档中 
            document.add(table); 
        } 
        catch (DocumentException e) 
        { 
            e.printStackTrace(); 
        } 
         
        //关闭流 
        document.close(); 
    } 
     
     
    /** 
     * 提供外界调用的接口，生成以head为表头，list为数据的pdf 
     * @param head  //数据表头 
     * @param list  //数据 
     * @return        //excel所在的路径 
     */ 
    public <T> String generatePDFs(String [] head,List<T> list) 
    { 
        final String FilePath = "pdfPath"; 
        String saveFilePathAndName = ""; 
     
        //获得存储的根目录 
        String savePath = new GetFilePlace().getFileDirFromProperties(FilePath); 
         
        //获得当天存储的路径,不存在则生成当天的文件夹 
        String realSavePath = new GenerateFold().getFold(savePath); 
         
        saveFilePathAndName = new GenerateFileName().generateFileName(realSavePath,"pdf"); 
         
        File file = new File(saveFilePathAndName); 
        try 
        { 
            file.createNewFile(); 
        } 
        catch (IOException e1) 
        { 
            // TODO Auto-generated catch block 
            e1.printStackTrace(); 
        } 
            initFile(file); 
        try 
        { 
            file.createNewFile();  //生成一个pdf文件 
        } 
        catch (IOException e) 
        { 
            // TODO Auto-generated catch block 
            e.printStackTrace(); 
        } 
        new CreatePdf(file).generatePDF(head,list,head.length); 
         
        return saveFilePathAndName; 
    } 
 
}

    public static void main(String[] args)  
    { 
        System.out.println("begin"); 
         
        String [] head = {"name","sex","adress","height","age","jj"}; 
         
        List<User> list = new ArrayList<User>(); 
        User user1 = new User("zhangsan",1,1.1f,"北京","男","AA"); 
        User user2 = new User("lisi",22222,3.2f,"上海","女","BB"); 
         
        list.add(user1); 
        list.add(user2); 
         
         
        String filePath = new CreatePdf().generatePDFs(head,list); 
        System.out.println(filePath); 
        System.out.println("end"); 
    }