//pdf转成图片
public void pdftoIamge(String pdfFile, String outpath) throws Exception {
InputStream is = new FileInputStream(pdfFile);
List piclist = new ArrayList();
Document document = new Document();
document.setFile(pdfFile);
float scale = 2.5f; // 缩放比例
float rotation = 0f; // 旋转角度
for (int i = 0; i 
BufferedImage image=(BufferedImage) document.getPageImage(i,GraphicsRenderingHints.SCREEN,
Page.BOUNDARY_CROPBOX, rotation, scale);
piclist.add(image);
}
document.dispose();
yPic(piclist, outpath);
is.close();
}
/**
* 将宽度相同的图片,竖向追加在一起,经过修改,没有了相同宽度这一限制
* @param piclist 文件流数组
* @param outPath 输出路径
*/
public void yPic(List piclist, String outPath) throws Exception{
// 纵向处理图片
if (piclist == null || piclist.size() <= 0) {
//Trace.logInfo(Trace.MODULE_ACTION, "图片数组为空!");
}
int height = 0, // 总高度
_width = 0, // 临时宽度
maxWidth = 0, // 最大宽度
_height = 0, // 临时的高度 , 或保存偏移高度
__height = 0, // 临时的高度,主要保存每个高度
picNum = piclist.size();// 图片的数量
int[] heightArray = new int[picNum]; // 保存每个文件的高度
int[] widthArray = new int[picNum]; // 保存每个文件的宽度
BufferedImage buffer = null; // 保存图片流
List imgRGB = new ArrayList(); // 保存所有的图片的RGB
int[] _imgRGB; // 保存一张图片中的RGB数据
for (int i = 0; i 
buffer = piclist.get(i);
if (buffer.getWidth() > maxWidth) {
// 获取最大宽度
maxWidth = buffer.getWidth();
}
}
for (int i = 0; i 
buffer = piclist.get(i);
heightArray[i] = _height = buffer.getHeight();// 图片高度
widthArray[i] = _width = buffer.getWidth();// 图片宽度
height += _height; // 获取总高度
_imgRGB = new int[_width * _height];// 从图片中读取RGB
_imgRGB = buffer.getRGB(0, 0, _width, _height, _imgRGB, 0, _width);
imgRGB.add(_imgRGB);
}
_height = 0; // 设置偏移高度为0
// 生成新图片
BufferedImage imageResult = new BufferedImage(maxWidth, height, BufferedImage.TYPE_INT_RGB);
for (int i = 0; i 
__height = heightArray[i];
_width = widthArray[i];
//if (i != 0)
_height += heightArray[i-1];// 计算偏移高度 ,若高度一致,则把此行打开
if (i != 0)
_height += heightArray[i - 1]; // 计算偏移高度 ,因高度不一致,所以i-1
//imageResult.setRGB(0,_height,widthArray[i],__height,imgRGB.get(i),0,widthArray[i]);//写入流中
// 居中,前两个参数为起始的宽度、高度
imageResult.setRGB((maxWidth-_width)/2,_height,_width,__height,imgRGB.get(i),0,_width);//写入流中
}
File outFile = new File(outPath);
try {
ImageIO.write(imageResult, "jpg", outFile);// 写图片
} catch (Exception e) {
// TODO: handle exception
throw new MyException(-20,"文件过大,不能通过审批直接查看");
}
}
/***
* 判断文件类型
* @param fileName
* @return
*/
public String getFileSufix(String fileName) throws Exception{
int splitIndex = fileName.lastIndexOf(".");
return fileName.substring(splitIndex + 1);
}
/***
*
* Word转PDF
*
* @param inputFile
* @param pdfFile
* @return
*/
public int word2PDF(String inputFile, String pdfFile) throws Exception{
// TODO Auto-generated method stub
try {
ComThread.InitSTA();
// 打开Word应用程序
ActiveXComponent app = new ActiveXComponent("Word.Application");
System.out.println("开始转化Word为PDF...");
long date = new Date().getTime();
// 设置Word不可见
app.setProperty("Visible", new Variant(false));// 禁用宏
app.setProperty("AutomationSecurity", new Variant(3));// 获得Word中所有打开的文档,返回documents对象
Dispatch docs = app.getProperty("Documents").toDispatch();
// 调用Documents对象中Open方法打开文档,并返回打开的文档对象Document
Dispatch doc = Dispatch.call(docs, "Open", inputFile, false, true).toDispatch();
File tofile = new File(pdfFile);
if (tofile.exists()) {
tofile.delete();
}
/***
*
* 调用Document对象的SaveAs方法,将文档保存为pdf格式
*
* Dispatch.call(doc, "SaveAs", pdfFile, wdFormatPDF
* word保存为pdf格式宏,值为17 )
*
*/
Dispatch.call(doc, "ExportAsFixedFormat", pdfFile, wdFormatPDF);// word保存为pdf格式宏,值为17
System.out.println(doc);            // 关闭文档
long date2 = new Date().getTime();
int time = (int) ((date2 - date) / 1000);
Dispatch.call(doc, "Close", false);// 关闭Word应用程序
app.invoke("Quit", 0);
return time;
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
return -1;
}finally{
ComThread.Release();
}
}
/***
*
* Excel转化成PDF
*
* @param inputFile
* @param pdfFile
* @return
*/
public int Ex2PDF(String inputFile, String pdfFile)throws Exception {
try {
ComThread.InitSTA();
ActiveXComponent ax = new ActiveXComponent("Excel.Application");
System.out.println("开始转化Excel为PDF...");
long date = new Date().getTime();
ax.setProperty("Visible", false);
ax.setProperty("AutomationSecurity", new Variant(3)); // 禁用宏
Dispatch excels = ax.getProperty("Workbooks").toDispatch();
System.out.println(inputFile);
Dispatch excel = Dispatch.invoke(excels,"Open",Dispatch.Method,new Object[]
{
inputFile, new Variant(false),new Variant(false)
},new int[9]).toDispatch();
File tofile = new File(pdfFile);
if (tofile.exists()) {
tofile.delete();
}
// 转换格式
Dispatch.invoke(excel,"ExportAsFixedFormat",Dispatch.Method,new Object[]{new Variant(0),//PDF格式=0
pdfFile, new Variant(xlTypePDF) //0=标准(生成的PDF图片不会变模糊)1=最小文件},new int[1]);
// 这里放弃使用SaveAs
/*
* Dispatch.invoke(excel,"SaveAs",Dispatch.Method,new Object[]{
* pdfFile, new Variant(57), new Variant(false), new Variant(57),
* new Variant(57), new Variant(false), new Variant(true), new
* Variant(57), new Variant(true), new Variant(true), new
* Variant(true) },new int[1]);
*/
long date2 = new Date().getTime();
int time = (int) ((date2 - date) / 1000);
Dispatch.call(excel, "Close", new Variant(false));
if (ax != null) {
ax.invoke("Quit", new Variant[] {});
ax = null;
}
return time;
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
return -1;
}finally{
ComThread.Release();
}

此为service层处理代码,可以在controller层进行文件的判断,我自己根据自身业务需要,

还是在service层进行的处理

public String fileToImg(String infile) throws Exception {
URL url = getClass().getProtectionDomain().getCodeSource().getLocation();
String path1 = url.toString();
int index = path1.indexOf("WebRoot");
if(index == -1){
index = path1.indexOf("classes");
}
if(index == -1){
index = path1.indexOf("bin");
}
path1 = path1.substring(0, index);
if(path1.startsWith("zip")){
//当class文件在war中时,此时返回zip:D:/...这样的路径
path1 = path1.substring(4);
}else if(path1.startsWith("file")){
//当class文件在class文件中时,此时返回file:/D:/...这样的路径
path1 = path1.substring(6);
}else if(path1.startsWith("jar")){
//当class文件在jar文件里面时,此时返回jar:file:/D:/...这样的路径
path1 = path1.substring(10);
}
path1 =  URLDecoder.decode(path1, "UTF-8");
path1 = path1.substring(0, path1.indexOf("PM Platform"));
String str1 = infile.replaceAll("\\\\", "/").replaceAll("//", "/");
String inputFile = str1.replaceAll( "///", "/").replaceAll("//", "/");
String kind = getFileSufix(inputFile);
File file = new File(inputFile);
String str = String.valueOf(new Date().getTime());
String pdfFile = path1+"image/"+str+".pdf";
String imgfile = path1+"image/"+str+".jpg";
//判断需要转化文件的类型(Excel、Word)
if (!file.exists()) {
return "0";//文件不存在
}
if (kind.equals("pdf")) {
try {
pdftoIamge(inputFile, imgfile);
return inputFile.substring(inputFile.lastIndexOf("/"), inputFile.length())+".jpg";//原文件就是PDF文件
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
return "-20";
}
}
if (kind.equals("jpg")||kind.equals("png")) {
return infile;//原文件就是图片
}
if (kind.equals("doc")||kind.equals("docx")||kind.equals("txt")) {
word2PDF(inputFile, pdfFile);
try {
pdftoIamge(pdfFile, imgfile);
return str+".jpg";
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
return "-20";
}
}else if(kind.equals("xls")||kind.equals("xlsx")){
Ex2PDF(inputFile, pdfFile);
try {
pdftoIamge(pdfFile, imgfile);
return str+".jpg";
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
return "-20";
}
}else {
return "0";
}
}

因为自身业务,对于路径进行了处理,当pdf转化异常,进行了异常的处理。不需要可以根据需要更改