Jxl导出Excel实现

public String CreateToExcel(String params) {

try {
params = java.net.URLDecoder.decode(params, "UTF-8");
} catch (UnsupportedEncodingException e1) {
e1.printStackTrace();
}
log.info("params：" + params);

AssistantAble assistant = new AssistantImpl();

String classID = com.system.Utils.getParameter("classId", params);
String listId = Utils.getParameter("listId", params);
String queryField = com.system.Utils.getParameter("queryField", params);
FormListImpl formList = (FormListImpl) XFormFactory.getXFormModel().getFormList(listId);
String condition = assistant.getSQLCondition(params, formList);

log.info("queryField:" + queryField);
log.info("condition:" + condition);

queryField = queryField.substring(0, queryField.lastIndexOf(","));
String[] queryFields = queryField.split(",");

int ClassId = Integer.parseInt(classID);
SysModel sysmodel = ModelFactory.getSysmodel();
MdpClass mdpClass = sysmodel.getMdpClassByClassID(ClassId);
// 获取表名称
String tableName = mdpClass.getName();
// 获取表的描述信息
String description = mdpClass.getDescription();
// 获取各个字段的名称
List<MdpAttributeImpl> list = mdpClass.getAllMdpAttributes();
Map<String,MdpAttributeImpl> map = new HashMap<String, MdpAttributeImpl>();
for(MdpAttributeImpl mdp : list){
map.put(mdp.getName().toUpperCase(), mdp);
}

Workbook wb = null;
WritableWorkbook book = null;
WritableSheet sheet = null;

HttpServletRequest req =mc.getHttpServletRequest();
String fileName = "";
//String filePath = "C://print//"+description+".xls";
String filePath = req.getRealPath("excels");
try {
fileName =UUID.randomUUID().toString()+".xls";
File myFilePath = new File( filePath+"/"+fileName);

// 1.首先定义个workbook
book = wb.createWorkbook(myFilePath);
// 2.定义个sheet
sheet = book.createSheet("第一页", 0);
// 设置标题
sheet.mergeCells(0, 0, queryFields.length - 1, 0);
WritableCellFormat format = getCellFormat(14);
format.setWrap(true);   //设置自动换行
Label label = new Label(0, 0, description, format);
sheet.addCell(label);

// 插入标题
for (int i = 0; i < queryFields.length; i++) {
WritableCell wc = null;
// 以第一行所有的列为模板，
wc = addCellWithValue(i, 1, map.get(queryFields[i].toUpperCase()).getDescription(),"string");
sheet.addCell(wc);
}

String sql = "select " + queryField + " from " + tableName + " where " + condition;
log.info("导出查询sql：" + sql);

//得到数据
ArrayList<Map<String,String>> resultMap = getGridList(ClassId, sql);
// 插入数据.
for(int m = 0; m < resultMap.size(); m++){
Map<String,String> data = resultMap.get(m);
for(int n = 0; n < queryFields.length; n ++){
String key = queryFields
.toUpperCase();
WritableCell wc = null;
Object fieldValue = data.get(key);
String dataType = map.get(key).getDataType();

int referenceType = map.get(key).getReferenceType();

//当为常量的时候
if(referenceType == 2){
String constName = map.get(key).getReference().getReferenceTable();
//log.info("常量键值：key:" + fieldValue);
if(fieldValue != null && !"".equals(fieldValue)){
fieldValue = sysmodel.getMdpConstantDisplayString(constName, fieldValue.toString());
}
//log.info("常量键值：value:" + fieldValue);
}

//两表外连接
if(referenceType == 1)
{
if (map.get(key).getReference() != null) {
String referenceTable=map.get(key).getReference().getReferenceTable();
String displayName=map.get(key).getReference().getDisplayName();
String storeName=map.get(key).getReference().getStoreName();
if(fieldValue != null && !"".equals(fieldValue)){
fieldValue = getReferenceShow(fieldValue.toString(),Integer.valueOf(referenceTable),displayName, storeName);
}
}
}

wc = addCellWithValue(n, 2 + m, fieldValue, dataType);
sheet.addCell(wc);
}
}
book.write();
book.close();
} catch (Exception e) {
e.printStackTrace();
}
return fileName;
}

/**
* 设置XLS单元格的样式,上下左右居中,带黑色边框
* params ps : 字体大小
* @return 单元格的样式
* 2011-2-21
*/
public WritableCellFormat getCellFormat(int ps){
//设置单元格字体为12号字体
WritableFont font = new WritableFont(WritableFont.TIMES, ps);
WritableCellFormat format = new WritableCellFormat(font);
try {
format.setAlignment(jxl.format.Alignment.CENTRE);// 左右居中
format.setVerticalAlignment(jxl.format.VerticalAlignment.CENTRE);// 上下居中
format.setBorder(Border.ALL, BorderLineStyle.THIN, Colour.BLACK);// 黑色边框
} catch (WriteException e) {
e.printStackTrace();
}
return format;
}

public WritableCell addCellWithValue(int col, int row, Object value,
String dataType) {
WritableCell wc = null;
WritableCellFormat format = getCellFormat(8);
try {
format.setWrap(true);  //设置自动换行
} catch (WriteException e1) {
e1.printStackTrace();
}
// 判断数据是否为STRING类型，是用LABLE形式插入，否则用NUMBER形式插入
if (value == null) {
wc = new jxl.write.Blank(col, row, format);
} else if (dataType instanceof String) {
jxl.write.Label label = new jxl.write.Label(col, row, value.toString(),format);
wc = label;
} else if (value instanceof Date) {
jxl.write.DateFormat df = new jxl.write.DateFormat("YYYY-MM-DD hh:mm:ss");
jxl.write.WritableCellFormat wcfDF = new jxl.write.WritableCellFormat(df);
try {
wcfDF.setWrap(true);
} catch (WriteException e) {
e.printStackTrace();
}
jxl.write.DateTime labelDT = new jxl.write.DateTime(col, row,new java.util.Date(), wcfDF);
wc = labelDT;
} else if (value instanceof Double) {
wc = new jxl.write.Number(col, row, new Double(value.toString()).doubleValue());
} else if (value instanceof Number) {
jxl.write.NumberFormat nf = new jxl.write.NumberFormat("#.##");
jxl.write.WritableCellFormat wcfN = new jxl.write.WritableCellFormat(nf);
try {
wcfN.setWrap(true);
} catch (WriteException e) {
e.printStackTrace();
}
jxl.write.Number labelNF = new jxl.write.Number(col, row,
new Double(value.toString()), wcfN);
wc = labelNF;

}
return wc;
}

public ArrayList<Map<String,String>> getGridList(int classid, String sql) {
SysModel sysmodel = ModelFactory.getSysmodel();
SysPersistence persistence = PersistenceFactory.getInstance(sysmodel);
ArrayList<Map<String,String>> list = null;
try {
list = persistence.getSearchResultToMap(classid, sql);
log.info(list.size());
} catch (Exception e) {
log.error("获取数据失败！", e);
}
return list;
}

private String getReferenceShow(String value, int classid,
String displayName, String storeName) throws PersistenceException {
SysModel sysmodel = ModelFactory.getSysmodel();
SysPersistence persistence = PersistenceFactory.getInstance(sysmodel);
String sql = "select " + displayName + " from "
+ sysmodel.getMdpClassByClassID(classid).getName() + " where "
+ storeName + " = '" + value + "'";
ArrayList<Map<String, String>> list = persistence.getSearchResultToMap(
classid, sql);
String result = "";
if (list.size() > 0) {
result = list.get(0).get(displayName.toUpperCase());
}
return result;
}
}